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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Class of Stock [Line Items]      
Stock Repurchased and Retired During Period, Shares 517,395 1,902,538  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 211,300 $ 211,300  
Stock Repurchased and Retired During Period, Value 34,300 119,000  
Debt and Capital Lease Obligations 193,129 193,129 $ 133,805
Long-term Debt, Fair Value 198,800 198,800 $ 139,100
2014 Share Repurchase Program [Member]      
Class of Stock [Line Items]      
Stock Repurchase Program, Authorized Amount 200,000 200,000  
2016 Share Repurchase Program [Member]      
Class of Stock [Line Items]      
Stock Repurchase Program, Authorized Amount $ 250,000 $ 250,000