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Debt Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Debt Instrument [Line Items]      
Total Debt $ 1,128,206   $ 1,061,071
Less: current portion (6,129) $ (5,766) (5,766)
Long-term debt 1,122,077 $ 1,055,305 1,055,305
Senior unsecured notes [Member]      
Debt Instrument [Line Items]      
Total Debt 425,211   414,862
Term Debt [Member]      
Debt Instrument [Line Items]      
Total Debt 596,899   615,095
Revolving credit facilities and other [Member]      
Debt Instrument [Line Items]      
Total Debt $ 106,096   $ 31,114