Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Dec. 09, 2016	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Class of Warrant or Right [Line Items]
Shares Issued, Price Per Share					$ 5.15
Proceeds from Issuance of Common Stock	$ 109,700
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 5.75
Warrants liability					$ 198		$ 449
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right					11,200,000
Warrants fair value adjustment		$ (251)	$ (1,624)	$ (11,129)
Total number of new units issued		0	0	7,772,021
underwriters option to purchase		2,900,000
per share net of underwrtiter discount		$ 4.9183
Common Stock, Shares, Issued	22,300,000				128,930,047		128,304,354
Unitssubjecttounderwritersoption						1,500,000
Common stock, shares authorized					250,000,000
Common stock, par value (in dollars per share)					$ 0.01
Preferred stock, shares authorized					5,000,000
Preferred stock, par value					$ 0.01
Common Stock, Shares, Outstanding		125,481,163	125,737,565	115,877,704	125,976,071		125,481,163
Treasury stock, shares held		2,953,976	2,717,569	2,638,093	2,953,976		2,823,191
Common Shares Outstanding and Treasury Shares Held Rollforward [Table]
Common shares outstanding, beginning balance		125,481,163	125,737,565	115,877,704
Exercise of common stock options, net		0	0	65,524
Grants of restricted stock, net		494,908	(256,402)	2,022,316
Common shares outstanding, ending balance		125,976,071	125,481,163	125,737,565
Treasury stock, beginning balance		2,823,191	2,717,569	2,638,093
Shares received upon vesting of restricted stock, net		130,785	105,622	79,476
Treasury stock, ending balance		2,953,976	2,823,191	2,717,569