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Debt (Schedule of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total debt $ 513,075 $ 420,705
Less: current maturities (998) (20,504)
Long-term debt 512,077 400,201
Senior unsecured notes due October 2021 [Member]
   
Debt Instrument [Line Items]    
Total debt 403,208 0
Senior secured revolving credit facility [Member]
   
Debt Instrument [Line Items]    
Total debt 108,000 122,480
Term loan [Member]
   
Debt Instrument [Line Items]    
Total debt 0 296,250
Other debt [Member]
   
Debt Instrument [Line Items]    
Total debt $ 1,867 $ 1,975