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Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 663,062	$ 610,506	$ 564,245	$ 605,253	$ 563,136	$ 510,305	$ 413,793	$ 377,812
Operating income (loss)	21,602	26,716	16,451	29,189	28,325	(21,784)	(3,313)	(19,719)	$ 93,958	$ (16,494)	$ 61,514
Net income (loss)	$ 19,005	$ 18,824	$ 7,006	$ 27,786	$ 13,687	$ (27,761)	$ (13,088)	$ (18,673)	$ 72,621	$ (45,835)	$ (39,911)
Net income (loss) per share
Basic (USD per share)	$ 0.41	$ 0.41	$ 0.15	$ 0.60	$ 0.30	$ (0.67)	$ (0.32)	$ (0.46)	$ 1.58	$ (1.08)	$ (1.06)
Diluted (USD per share)	$ 0.41	$ 0.41	$ 0.15	$ 0.58	$ 0.30	$ (0.67)	$ (0.32)	$ (0.46)	$ 1.57	$ (1.08)	$ (1.06)

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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