Supplemental Information - Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2020	Sep. 30, 2019
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues	$ 283,423	$ 1,415,803	$ 342,907	$ 1,475,088	$ 1,513,779	$ 870,843	$ 1,033,828
Asset Impairment Charges	159	8,599	1,944	87,204	5,471	19,159	1,944
Costs and Expenses	254,534	1,336,343	313,486	1,473,654	1,382,876	812,527	965,284
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	16,287	20,867	8,907	(88,669)	86,022	26,964	19,102
Income Tax Expense (Benefit)	1,452	10,316	3,457	29,615	(168,358)	7,029	6,292
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ 360	$ (17,557)	$ (5,058)	$ (138,362)	$ 204,832	$ (6,042)	$ (6,506)
Weighted Average Number of Shares Outstanding, Basic	73,207,619	69,132,100	72,044,480	57,218,994	55,255,797	72,713,257	68,154,306
Weighted Average Number of Shares Outstanding, Diluted	73,476,779	69,132,100	72,044,480	57,218,994	55,481,786	72,713,257	68,154,306
Income (Loss) from Continuing Operations, Per Basic Share	$ 0	$ (250)	$ (0.07)	$ (2,420)	$ 3,710	$ (0.08)	$ (0.10)
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0	$ (250)	$ (0.07)	$ (2,420)	$ 3,700	$ (0.08)	$ (0.10)
Previously Reported
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues		$ 1,415,803		$ 1,476,203	$ 1,513,779
Asset Impairment Charges		7,819		80,057	4,415
Costs and Expenses		1,335,563		1,466,507	1,381,820
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		21,647		(80,407)	87,078
Income Tax Expense (Benefit)		10,533		31,603	(168,064)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		$ (16,994)		$ (132,088)	$ 205,594
Weighted Average Number of Shares Outstanding, Basic		69,132,100		57,218,994	55,255,797
Weighted Average Number of Shares Outstanding, Diluted		69,132,100		57,218,994	55,481,786
Income (Loss) from Continuing Operations, Per Basic Share		$ (250)		$ (2,310)	$ 3,720
Income (Loss) from Continuing Operations, Per Diluted Share		$ (250)		$ (2,310)	$ 3,710
Restatement Adjustment
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues		$ 0		$ (1,115)	$ 0
Asset Impairment Charges		780		7,147	1,056
Costs and Expenses		780		7,147	1,056
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		(780)		(8,262)	(1,056)
Income Tax Expense (Benefit)		(217)		(1,988)	(294)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		$ (563)		$ (6,274)	$ (762)
Weighted Average Number of Shares Outstanding, Basic		0		0	0
Weighted Average Number of Shares Outstanding, Diluted		0		0	0
Income (Loss) from Continuing Operations, Per Basic Share		$ 0		$ (110)	$ (10.00)
Income (Loss) from Continuing Operations, Per Diluted Share		$ 0		$ (110)	$ (10.00)