Annual report pursuant to Section 13 and 15(d)

Dividends to Shareholders Dividends to Shareholders (Details)

v2.4.1.9
Dividends to Shareholders Dividends to Shareholders (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 27, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 29, 2012
Sep. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Feb. 20, 2015
Dec. 31, 2011
Subsequent Event [Line Items]                                    
Common Stock, Dividends, Per Share, Declared $ 1.00us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 1.450us-gaap_CommonStockDividendsPerShareDeclared $ 0.45us-gaap_CommonStockDividendsPerShareDeclared $ 1.480us-gaap_CommonStockDividendsPerShareDeclared    
Common Stock, Dividends, Per Share, Cash Paid                           $ 0.09us-gaap_CommonStockDividendsPerShareCashPaid $ 0.09us-gaap_CommonStockDividendsPerShareCashPaid $ 0.12us-gaap_CommonStockDividendsPerShareCashPaid    
Dividends Payable   $ 38,377us-gaap_DividendsPayableCurrentAndNoncurrent       $ 11,806us-gaap_DividendsPayableCurrentAndNoncurrent               $ 38,377us-gaap_DividendsPayableCurrentAndNoncurrent $ 11,806us-gaap_DividendsPayableCurrentAndNoncurrent     $ 38,582us-gaap_DividendsPayableCurrentAndNoncurrent
Subsequent Event [Member]                                    
Subsequent Event [Line Items]                                    
Common Stock, Dividends, Per Share, Declared                                 $ 0.09us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember