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Long-Term Debt - Debt Maturities Table (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Debt maturities, within 1 year $ 7,727  
Debt maturities, year 1 through year 2 10,730  
Debt maturities, year 2 through year 3 10,090  
Debt maturities, year 3 through year 4 148,566  
Debt maturities, year 4 through year 5 17,331  
Debt maturities, thereafter 1,063,423  
Total long-term debt $ 1,257,867 $ 1,295,761