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Long-Term Debt - Interest Expense And Capitalized Interest (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]      
Interest expense $ 45,110 $ 40,024 $ 33,064
Interest income (2,086) (2,068) (4,786)
Capitalized interest (11,785) (11,042) (10,419)
Net interest expense $ 31,239 $ 26,914 $ 17,859