UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Warrants [Member]	Additional Paid in Capital [Member]	Treasury Stock [Member]	Accumulated Earnings (Deficit) [Member]
Balance at Dec. 31, 2017	$ 393,933	$ 3	$ 4,788	$ 387,856		$ 1,286
Net income (loss)	3,239	0	0	0		3,239
Share-based compensation expense	1,176	0	0	1,176		0
Restricted shares repurchased	(208)	0	0	(208)		0
Balance at Mar. 31, 2018	398,140	3	4,788	388,824		4,525
Balance at Dec. 31, 2017	393,933	3	4,788	387,856		1,286
Net income (loss)	(24,638)
Balance at Sep. 30, 2018	371,579	3	4,788	390,140		(23,352)
Balance at Mar. 31, 2018	398,140	3	4,788	388,824		4,525
Net income (loss)	(25,279)	0	0	0		(25,279)
Share-based compensation expense	336	0	0	336		0
Restricted shares repurchased	(301)	0	0	(301)		0
Balance at Jun. 30, 2018	372,896	3	4,788	388,859		(20,754)
Net income (loss)	(2,598)	0	0	0		(2,598)
Share-based compensation expense	1,578	0	0	1,578		0
Restricted shares repurchased	(306)	0	0	(306)		0
Other	9	0	0	9		0
Balance at Sep. 30, 2018	371,579	3	4,788	390,140		(23,352)
Balance at Dec. 31, 2018	416,558	3	4,788	355,872	$ 0	55,895
Net income (loss)	(31,477)	0	0	0	0	(31,477)
Costs incurred in conjunction with tender offer	(107)	0	0	(107)	0	0
Share-based compensation expense	1,443	0	0	1,443	0	0
Common stock repurchased and retired under the share repurchase program	(920)	0	0	(920)	0	0
Balance at Mar. 31, 2019	385,497	3	4,788	356,288	0	24,418
Balance at Dec. 31, 2018	416,558	3	4,788	355,872	0	55,895
Net income (loss)	(7,679)
Balance at Sep. 30, 2019	480,045	209	4,790	435,019	0	40,027
Balance at Mar. 31, 2019	385,497	3	4,788	356,288	0	24,418
Net income (loss)	18,641	0	0	0	0	18,641
Share-based compensation expense	1,479	0	0	1,479	0	0
Common stock repurchased and retired under the share repurchase program	(331)	0	0	(331)	0	0
Restricted shares repurchased	(199)	0	0	(199)	0	0
Balance at Jun. 30, 2019	405,087	3	4,788	357,237	0	43,059
Net income (loss)	5,157	0	0	0	0	5,157
Equity transactions related to the Merger	91,246	206	2	91,038	0	0
Treasury shares acquired in the Merger	(2,723)	0	0	0	(2,723)	0
Retirement of treasury shares	0	0	0	(2,723)	2,723	0
Share-based compensation expense	1,151	0	0	1,151	0	0
Common stock repurchased and retired under the share repurchase program	(12,000)	0	0	(12,000)	0	0
Dividends	(8,189)	0	0	0	0	(8,189)
Restricted shares repurchased	(115)	0	0	(115)	0	0
Other	431	0	0	431	0	0
Balance at Sep. 30, 2019	$ 480,045	$ 209	$ 4,790	$ 435,019	$ 0	$ 40,027