Supplemental Information - Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues	$ 259,678	$ 362,130	$ 587,420	$ 690,921	$ 1,415,803	$ 1,475,088	$ 1,513,779
Asset Impairment Charges	18,839	0	19,000	0	8,599	87,204	5,471
Costs and Expenses	259,580	338,688	557,993	651,798	1,336,343	1,473,654	1,382,876
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(4,617)	9,215	10,677	10,195	20,867	(88,669)	86,022
Income Tax Expense (Benefit)	(7,923)	2,088	5,577	2,835	10,316	29,615	(168,358)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ (4,102)	$ 775	$ (6,539)	$ (1,448)	$ (17,557)	$ (138,362)	$ 204,832
Weighted Average Number of Shares Outstanding, Basic	72,528,455	71,915,832	72,463,058	66,118,749	69,132,100	57,218,994	55,255,797
Weighted Average Number of Shares Outstanding, Diluted	72,528,455	72,024,689	72,463,058	66,118,749	69,132,100	57,218,994	55,481,786
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.06)	$ 0.01	$ (0.09)	$ (0.02)	$ (250)	$ (2,420)	$ 3,710
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.06)	$ 0.01	$ (0.09)	$ (0.02)	$ (250)	$ (2,420)	$ 3,700
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)