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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Numerator:
Net income (loss)	$ (2,018)	$ (104,893)	$ (15,357)	$ (35,689)	$ (36,168)	$ 7,695	$ 2,605	$ 3,006	$ (157,957)	$ (22,862)	$ 6,820
Denominator:
Weighted-average common shares outstanding, Basic (in shares)	108,826	107,897	107,737	109,358	109,737	109,555	110,060	111,464	108,450	110,198	110,162
Effect of potential dilutive common shares									0	0	2,978
Denominator:
Weighted-average common shares outstanding, Diluted (in shares)	108,826	107,897	107,737	109,358	109,737	113,119	112,565	115,325	108,450	110,198	113,140
Earnings Per Share, Basic									$ (1.46)	$ (0.21)	$ 0.06
Earnings Per Share, Diluted									$ (1.46)	$ (0.21)	$ 0.06

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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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