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Net Income (Loss) Per Share (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
Basic Net Income (Loss) Per Share
Basic net income (loss)									$ 109,493	$ (313,142)	$ 104,222
Weighted average common shares outstanding	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
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
Diluted net income (loss)									$ 109,493	$ (313,142)	$ 104,222
Weighted average common shares outstanding	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
Dilutive stock options and RSU’s									3,252,000		6,252,000
Weighted average shares used to compute 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
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
Anti-dilutive securities
Potential common shares excluded from diluted net loss per share computation									8,624,931	13,103,527	17,278,857
Stock Options
Anti-dilutive securities
Potential common shares excluded from diluted net loss per share computation									8,255,992	12,585,213	2,792,424
Convertible Senior Notes 0.375 Percent Due 2018
Anti-dilutive securities
Potential common shares excluded from diluted net loss per share computation										149,375	7,245,149
Convertible Senior Notes 1.25 Percent Due 2020
Anti-dilutive securities
Potential common shares excluded from diluted net loss per share computation									368,939	368,939	7,241,284

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