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Interim Consolidated Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interim Consolidated Financial Information (Unaudited)
Revenues	$ 528,402	$ 449,683	$ 521,516	$ 382,282	$ 444,156	$ 381,534	$ 326,444	$ 384,082	$ 1,881,883
Net income (loss)	$ 69,063	$ 29,176	$ 52,394	$ (41,140)	$ (149,629)	$ 36,054	$ (12,484)	$ (187,083)	$ 109,493	$ (313,142)	$ 104,222
Basic net income (loss) per share	$ 0.32	$ 0.14	$ 0.25	$ (0.19)	$ (0.71)	$ 0.17	$ (0.06)	$ (0.96)	$ 0.52	$ (1.53)	$ 0.55
Diluted net income (loss) per share	$ 0.32	$ 0.14	$ 0.24	$ (0.19)	$ (0.71)	$ 0.17	$ (0.06)	$ (0.96)	$ 0.51	$ (1.53)	$ 0.54
Shares used in computation of basic net income (loss) per share	213,013,000	212,627,000	212,210,000	211,681,000	211,125,000	206,796,000	205,141,000	195,260,000	212,383,000	204,580,000	187,873,000
Shares used in computation of diluted net income (loss) per share	216,042,000	215,964,000	215,103,000	211,681,000	211,125,000	212,610,000	205,141,000	195,260,000	215,635,000	204,580,000	194,125,000

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