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Shareholders' Equity (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Sep. 30, 2012
Oct. 02, 2011
Class of Stock [Line Items]        
Common Stock, Dividends, Per Share, Declared     $ 0.20  
Cash dividends paid     $ 12,304,000 $ 0
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     1,038,521,000  
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests     8,100,000  
Retirement of common stock, shares     (57,457)  
Acquisition of ownership interests in MCF     35,154,000 0
Comprehensive income (loss):        
Total comprehensive income 14,842,000 13,772,000 51,882,000 52,117,000
Ending Balance 1,051,839,000   1,051,839,000  
Common Stock [Member]
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     852,000  
Beginning Balance, Shares     61,181,000  
Stock option and restricted stock award transactions, shares     479,000  
Stock option and restricted stock award transactions     5,000  
Cancellation of restricted stock, shares     (28,000)  
Cancellation of restricted stock, Value     0  
Retirement of common stock, shares     (58,000)  
Retirement of common stock, Value     (1,000)  
Treasury Stock, Shares, Acquired     (2,000)  
Stock Issued During Period, Shares, Treasury Stock Reissued     (20,000)  
Comprehensive income (loss):        
Ending Balance 856,000   856,000  
Ending Balance, Shares 61,592,000   61,592,000  
Additional Paid-in Capital [Member]
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     727,297,000  
Stock option and restricted stock award transactions     1,841,000  
Tax provision related to equity compensation     241,000  
Stock based compensation expense     5,113,000  
Cancellation of restricted stock, Value     0  
Retirement of common stock, Value     (628,000)  
Stock Issued During Period, Value, Treasury Stock Reissued     4,000  
Acquisition of ownership interests in MCF     (18,856,000)  
Adjustments to Additional Paid in Capital, Other     (51,000)  
Comprehensive income (loss):        
Ending Balance 714,961,000   714,961,000  
Retained Earnings [Member]
        
Class of Stock [Line Items]        
Cash dividends paid     (12,304,000)  
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     507,170,000  
Retirement of common stock, Value     (406,000)  
Stock Issued During Period, Value, Treasury Stock Reissued     (1,000)  
Comprehensive income (loss):        
Total comprehensive income     53,143,000  
Ending Balance 547,602,000   547,602,000  
Accumulated Other Comprehensive Income (Loss) [Member]
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     1,930,000  
Comprehensive income (loss):        
Total comprehensive income     (361,000)  
Ending Balance 1,569,000   1,569,000  
Treasury Stock [Member]
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     (214,031,000)  
Beginning Balance, Shares     24,004,000  
Stock option and restricted stock award transactions     0  
Treasury Stock, Shares, Acquired     2,000  
Treasury Stock, Value, Acquired, Cost Method     (48,000)  
Stock Issued During Period, Value, Treasury Stock Reissued     370,000  
Stock Issued During Period, Shares, Treasury Stock Reissued     (20,000)  
Comprehensive income (loss):        
Ending Balance (213,709,000)   (213,709,000)  
Ending Balance, Shares 23,986,000   23,986,000  
Noncontrolling Interest [Member]
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     15,303,000  
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests     (8,085,000)  
Distribution to noncontrolling interest     (5,758,000)  
Adjustments to Additional Paid in Capital, Other     0  
Comprehensive income (loss):        
Total comprehensive income     (900,000)  
Ending Balance 560,000   560,000  
Stockholders' Equity, Total [Member]
        
Class of Stock [Line Items]        
Cash dividends paid     (12,304,000)  
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     1,038,521,000  
Stock option and restricted stock award transactions     1,846,000  
Tax provision related to equity compensation     241,000  
Stock based compensation expense     5,113,000  
Cancellation of restricted stock, Value     0  
Retirement of common stock, Value     (1,035,000)  
Treasury Stock, Value, Acquired, Cost Method     (48,000)  
Stock Issued During Period, Value, Treasury Stock Reissued     373,000  
Acquisition of ownership interests in MCF     (26,941,000)  
Distribution to noncontrolling interest     (5,758,000)  
Adjustments to Additional Paid in Capital, Other     (51,000)  
Comprehensive income (loss):        
Total comprehensive income     $ 51,882,000