Revenue Recognition - Other Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues from contracts with customers	$ 373,703
Accounting Standards Update 2014-09 | Revenue gross-up
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues from contracts with customers	$ 45,691	$ 57,565