| 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 | $ 1.00 | $ 0.090 | $ 0.090 | $ 0.090 | $ 0.090 | $ 0.090 | $ 0.090 | $ 0.090 | $ 0.090 | $ 0.090 | $ 0.090 | $ 0.090 | $ 0.090 | $ 1.450 | $ 0.45 | $ 1.480 | ||
| Common Stock, Dividends, Per Share, Cash Paid | $ 0.09 | $ 0.09 | $ 0.12 | |||||||||||||||
| Dividends Payable | $ 38,377 | $ 11,806 | $ 38,377 | $ 11,806 | $ 38,582 | |||||||||||||
| Subsequent Event [Member] | ||||||||||||||||||
| Subsequent Event [Line Items] | ||||||||||||||||||
| Common Stock, Dividends, Per Share, Declared | $ 0.09 | |||||||||||||||||