Guarantor/Non Guarantor Condensed Consolidating Financial Statements (Balance Sheet)) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	May 31, 2020	May 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 15,161				$ 24,619
Restricted cash	16,173				998
Receivables, net of allowance	64,708				123,526
Intercompany receivable (payable)	0				0
Inventory	13,056				22,453
Assets held for sale	7,292				3,447
Prepaid expenses and other current assets	5,649				7,869
Total current assets	122,039				182,912
Net property and equipment	186,240				471,170
Investments in subsidiaries	0				0
Intangible assets, net of accumulated amortization	9,292				0
Deferred income taxes	9,139				11,540
Operating lease assets	5,040				7,264
Other noncurrent assets	12,050				1,068
Total assets	343,800	$ 352,623			673,954	$ 723,669
Current liabilities:
Accounts payable	16,148				32,551
Deferred revenues	642				1,339
Accrued expenses	49,146				57,691
Total current liabilities	65,936				91,581
Long-term debt, less unamortized discount and debt issuance costs	142,005				467,699
Noncurrent operating lease liabilities	4,098				5,700
Deferred income taxes	1,071				4,417
Other noncurrent liabilities	1,548				481
Total liabilities not subject to compromise	214,658				569,878
Total shareholders' equity	129,142	$ 0	$ 1,149	$ 35,293	104,076	$ 138,345	$ 150,967	$ 165,058
Total liabilities and stockholders' equity	343,800				673,954
Eliminations [Member]
Current assets:
Cash and cash equivalents	0				0
Restricted cash	0				0
Receivables, net of allowance	302				117
Intercompany receivable (payable)	0				0
Inventory	0				0
Assets held for sale	0				0
Prepaid expenses and other current assets	405				0
Total current assets	707				117
Net property and equipment	0				0
Investments in subsidiaries	(287,847)				(595,076)
Intangible assets, net of accumulated amortization	0
Deferred income taxes	(1)				(44,224)
Operating lease assets	0				0
Other noncurrent assets	0				0
Total assets	(287,141)				(639,183)
Current liabilities:
Accounts payable	0				0
Deferred revenues	405				0
Accrued expenses	(1,012)				117
Total current liabilities	(607)				117
Long-term debt, less unamortized discount and debt issuance costs	0				0
Noncurrent operating lease liabilities	0				0
Deferred income taxes	(1)				(44,224)
Other noncurrent liabilities	1,314				0
Total liabilities not subject to compromise	706				(44,107)
Total shareholders' equity	(287,847)				(595,076)
Total liabilities and stockholders' equity	(287,141)				(639,183)
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	0				0
Restricted cash	0				0
Receivables, net of allowance	50,286				92,394
Intercompany receivable (payable)	30,855				64,485
Inventory	5,321				10,325
Assets held for sale	7,292				3,447
Prepaid expenses and other current assets	2,510				4,122
Total current assets	96,264				174,773
Net property and equipment	160,610				441,567
Investments in subsidiaries	37,491				47,953
Intangible assets, net of accumulated amortization	0
Deferred income taxes	0				0
Operating lease assets	2,177				3,581
Other noncurrent assets	82				562
Total assets	296,624				668,436
Current liabilities:
Accounts payable	7,720				24,436
Deferred revenues	74				513
Accrued expenses	35,994				44,893
Total current liabilities	43,788				69,842
Long-term debt, less unamortized discount and debt issuance costs	0				0
Noncurrent operating lease liabilities	1,587				2,536
Deferred income taxes	818				48,641
Other noncurrent liabilities	75				294
Total liabilities not subject to compromise	46,268				121,313
Total shareholders' equity	250,356				547,123
Total liabilities and stockholders' equity	296,624				668,436
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	2,627				10,158
Restricted cash	0				0
Receivables, net of allowance	13,707				30,908
Intercompany receivable (payable)	(28,069)				(35,821)
Inventory	7,735				12,128
Assets held for sale	0				0
Prepaid expenses and other current assets	265				898
Total current assets	(3,735)				18,271
Net property and equipment	25,109				27,229
Investments in subsidiaries	0				0
Intangible assets, net of accumulated amortization	0
Deferred income taxes	9,140				11,540
Operating lease assets	63				569
Other noncurrent assets	10,184				0
Total assets	40,761				57,609
Current liabilities:
Accounts payable	2,785				6,304
Deferred revenues	163				826
Accrued expenses	278				2,111
Total current liabilities	3,226				9,241
Long-term debt, less unamortized discount and debt issuance costs	0				0
Noncurrent operating lease liabilities	44				415
Deferred income taxes	0				0
Other noncurrent liabilities	0				0
Total liabilities not subject to compromise	3,270				9,656
Total shareholders' equity	37,491				47,953
Total liabilities and stockholders' equity	40,761				57,609
Parent [Member]
Current assets:
Cash and cash equivalents	12,534				14,461
Restricted cash	16,173				998
Receivables, net of allowance	413				107
Intercompany receivable (payable)	(2,786)				(28,664)
Inventory	0				0
Assets held for sale	0				0
Prepaid expenses and other current assets	2,469				2,849
Total current assets	28,803				(10,249)
Net property and equipment	521				2,374
Investments in subsidiaries	250,356				547,123
Intangible assets, net of accumulated amortization	9,292
Deferred income taxes	0				44,224
Operating lease assets	2,800				3,114
Other noncurrent assets	1,784				506
Total assets	293,556				587,092
Current liabilities:
Accounts payable	5,643				1,811
Deferred revenues	0				0
Accrued expenses	13,886				10,570
Total current liabilities	19,529				12,381
Long-term debt, less unamortized discount and debt issuance costs	142,005				467,699
Noncurrent operating lease liabilities	2,467				2,749
Deferred income taxes	254				0
Other noncurrent liabilities	159				187
Total liabilities not subject to compromise	164,414				483,016
Total shareholders' equity	129,142				104,076
Total liabilities and stockholders' equity	$ 293,556				$ 587,092