Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ (58,574)	$ 130,133	$ (120,548)
Debt Instrument, Convertible, If-converted Value in Excess of Principal	$ 0	$ 5,067	$ 0
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	164,000	0
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	0	10,365,000	0
Weighted Average Number of Shares Outstanding, Diluted	110,841,000	116,747,000	105,830,000
Earnings Per Share, Basic	$ (0.53)	$ 1.23	$ (1.14)
Earnings Per Share, Diluted	$ (0.53)	$ 1.16	$ (1.14)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	11,113,054	8,206,390	7,438,134
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities	$ (58,574)	$ 135,200	$ (120,548)
Weighted Average Number of Shares Issued, Basic	110,841,000	106,218,000	105,830,000