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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Accounting Policies [Abstract]      
Debt and Capital Lease Obligations $ 146,344 $ 146,344 $ 155,714
Long-term Debt, Fair Value 153,000 153,000 $ 165,500
Stock Repurchase Program, Authorized Amount $ 200,000 $ 200,000  
Stock Repurchased and Retired During Period, Shares 406,950 587,588  
Stock Repurchased and Retired During Period, Value $ 29,100 $ 42,400  
Total Stock Repurchased And Retired Shares 658,208 658,208  
Total Stock Repurchased And Retired Value $ 47,900 $ 47,900  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 152,100 $ 152,100