Description of the Business and Summary of Significant Accounting Policies - Cash Paid for Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest Paid, Including Capitalized Interest, Operating and Investing Activities [Abstract]
Debt interest paid	$ 74,821	$ 63,325	$ 60,780
Capitalized interest	(10,013)	(6,645)	(1,721)
Cash paid for interest, net of capitalized interest	$ 64,808	$ 56,680	$ 59,059