Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest in Subsidiary	Total
Beginning balance at Dec. 31, 2018	$ 20	$ 1,198,769	$ (688,653)	$ (2,138)	$ 17,011	$ 525,009
Beginning balance (in shares) at Dec. 31, 2018	203,599,892
Increase (Decrease) in Stockholders' Equity
Issuance of common stock		175				175
Issuance of common stock (in shares)	1,052,040
Stock-based compensation		1,246				1,246
Net income (loss)			(10,946)		(1,879)	(12,825)
Other comprehensive income (loss)				374		374
Increase in ownership in subsidiary		228			(228)
Ending balance at Mar. 31, 2019	$ 20	1,200,418	(699,599)	(1,764)	14,904	513,979
Ending balance (in shares) at Mar. 31, 2019	204,651,932
Beginning balance at Dec. 31, 2018	$ 20	1,198,769	(688,653)	(2,138)	17,011	525,009
Beginning balance (in shares) at Dec. 31, 2018	203,599,892
Increase (Decrease) in Stockholders' Equity
Net income (loss)					(3,590)	(19,919)
Other comprehensive income (loss)						698
Ending balance at Jun. 30, 2019	$ 20	1,201,340	(704,982)	(1,440)	13,193	508,131
Ending balance (in shares) at Jun. 30, 2019	204,655,146
Beginning balance at Mar. 31, 2019	$ 20	1,200,418	(699,599)	(1,764)	14,904	513,979
Beginning balance (in shares) at Mar. 31, 2019	204,651,932
Increase (Decrease) in Stockholders' Equity
Issuance of common stock		4				4
Issuance of common stock (in shares)	3,214
Stock-based compensation		918				918
Net income (loss)			(5,383)		(1,711)	(7,094)
Other comprehensive income (loss)				324		324
Ending balance at Jun. 30, 2019	$ 20	1,201,340	(704,982)	(1,440)	13,193	508,131
Ending balance (in shares) at Jun. 30, 2019	204,655,146
Beginning balance at Dec. 31, 2019	$ 20	1,203,186	(668,232)	(1,566)	9,621	$ 543,029
Beginning balance (in shares) at Dec. 31, 2019	204,723,055					204,723,055
Increase (Decrease) in Stockholders' Equity
Issuance of common stock		194				$ 194
Repurchase of common stock		(4,244)				(4,244)
Repurchase of common stock (in shares)	(2,810,449)
Issuance of common stock (in shares)	871,010
Stock-based compensation		1,054				1,054
Net income (loss)			1,704		(805)	899
Other comprehensive income (loss)				(1,915)		(1,915)
Increase in ownership in subsidiary		(1,388)			1,388
Ending balance at Mar. 31, 2020	$ 20	1,198,802	(666,528)	(3,481)	10,204	539,017
Ending balance (in shares) at Mar. 31, 2020	202,783,616
Beginning balance at Dec. 31, 2019	$ 20	1,203,186	(668,232)	(1,566)	9,621	$ 543,029
Beginning balance (in shares) at Dec. 31, 2019	204,723,055					204,723,055
Increase (Decrease) in Stockholders' Equity
Repurchase of common stock						$ (10,500)
Repurchase of common stock (in shares)						(6,112,499)
Net income (loss)					(1,106)	$ (6,138)
Other comprehensive income (loss)						(909)
Ending balance at Jun. 30, 2020	$ 20	1,193,197	(673,264)	(2,475)	9,903	$ 527,381
Ending balance (in shares) at Jun. 30, 2020	199,506,780					199,506,780
Beginning balance at Mar. 31, 2020	$ 20	1,198,802	(666,528)	(3,481)	10,204	$ 539,017
Beginning balance (in shares) at Mar. 31, 2020	202,783,616
Increase (Decrease) in Stockholders' Equity
Issuance of common stock		41				41
Repurchase of common stock		(6,406)				(6,406)
Repurchase of common stock (in shares)	(3,302,050)
Issuance of common stock (in shares)	25,214
Stock-based compensation		760				760
Net income (loss)			(6,736)		(301)	(7,037)
Other comprehensive income (loss)				1,006		1,006
Ending balance at Jun. 30, 2020	$ 20	$ 1,193,197	$ (673,264)	$ (2,475)	$ 9,903	$ 527,381
Ending balance (in shares) at Jun. 30, 2020	199,506,780					199,506,780