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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Class of Stock [Line Items]      
Stock Repurchased and Retired During Period, Shares 622,663 1,385,143  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 245,600 $ 245,600  
Stock Repurchased and Retired During Period, Value 40,000 84,700  
Debt and Capital Lease Obligations 218,332 218,332 $ 133,805
Long-term Debt, Fair Value 223,600 223,600 $ 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