Guarantor/Non Guarantor Condensed Consolidating Financial Statements (Balance Sheet)) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 15,457	$ 24,619
Restricted cash	998	998
Receivables, net of allowance	102,923	123,526
Intercompany receivable (payable)	0	0
Inventory	21,619	22,453
Assets held for sale	1,825	3,447
Prepaid expenses and other current assets	8,129	7,869
Total current assets	150,951	182,912
Net property and equipment	439,954	471,170
Investments in subsidiaries	0	0
Deferred income taxes	9,264	11,540
Operating lease assets	7,972	7,264
Other noncurrent assets	7,593	1,068
Total assets	615,734	673,954	$ 737,091
Current liabilities:
Accounts payable	28,774	32,551
Deferred revenues	997	1,339
Commitment premium	9,584	0
Debtor in possession financing	4,000	0
Accrued expenses	49,673	57,691
Total current liabilities	93,028	91,581
Long-term debt, less unamortized discount and debt issuance costs	170,921	467,699
Noncurrent operating lease liabilities	6,434	5,700
Deferred income taxes	3,256	4,417
Other noncurrent liabilities	383	481
Total liabilities not subject to compromise	274,022	569,878
Liabilities subject to compromise	306,419	0
Total shareholders' equity	35,293	104,076	$ 150,967	$ 165,058
Total liabilities and stockholders' equity	615,734	673,954
Eliminations [Member]
Current assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Receivables, net of allowance	(171)	117
Intercompany receivable (payable)	0	0
Inventory	0	0
Assets held for sale	0	0
Prepaid expenses and other current assets	0	0
Total current assets	(171)	117
Net property and equipment	0	0
Investments in subsidiaries	(549,537)	(595,076)
Deferred income taxes	(38,948)	(44,224)
Operating lease assets	0	0
Other noncurrent assets	0	0
Total assets	(588,656)	(639,183)
Current liabilities:
Accounts payable	0	0
Deferred revenues	0	0
Commitment premium	0
Debtor in possession financing	0
Accrued expenses	(171)	117
Total current liabilities	(171)	117
Long-term debt, less unamortized discount and debt issuance costs	0	0
Noncurrent operating lease liabilities	0	0
Deferred income taxes	(38,948)	(44,224)
Other noncurrent liabilities	0	0
Total liabilities not subject to compromise	(39,119)	(44,107)
Liabilities subject to compromise	0
Total shareholders' equity	(549,537)	(595,076)
Total liabilities and stockholders' equity	(588,656)	(639,183)
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Receivables, net of allowance	84,517	92,394
Intercompany receivable (payable)	59,530	64,485
Inventory	9,530	10,325
Assets held for sale	1,825	3,447
Prepaid expenses and other current assets	4,675	4,122
Total current assets	160,077	174,773
Net property and equipment	410,567	441,567
Investments in subsidiaries	41,392	47,953
Deferred income taxes	0	0
Operating lease assets	4,530	3,581
Other noncurrent assets	459	562
Total assets	617,025	668,436
Current liabilities:
Accounts payable	20,793	24,436
Deferred revenues	428	513
Commitment premium	0
Debtor in possession financing	0
Accrued expenses	41,742	44,893
Total current liabilities	62,963	69,842
Long-term debt, less unamortized discount and debt issuance costs	0	0
Noncurrent operating lease liabilities	3,475	2,536
Deferred income taxes	42,204	48,641
Other noncurrent liabilities	238	294
Total liabilities not subject to compromise	108,880	121,313
Liabilities subject to compromise	0
Total shareholders' equity	508,145	547,123
Total liabilities and stockholders' equity	617,025	668,436
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	7,520	10,158
Restricted cash	0	0
Receivables, net of allowance	18,420	30,908
Intercompany receivable (payable)	(32,599)	(35,821)
Inventory	12,089	12,128
Assets held for sale	0	0
Prepaid expenses and other current assets	1,002	898
Total current assets	6,432	18,271
Net property and equipment	27,243	27,229
Investments in subsidiaries	0	0
Deferred income taxes	9,264	11,540
Operating lease assets	531	569
Other noncurrent assets	5,839	0
Total assets	49,309	57,609
Current liabilities:
Accounts payable	5,608	6,304
Deferred revenues	569	826
Commitment premium	0
Debtor in possession financing	0
Accrued expenses	1,364	2,111
Total current liabilities	7,541	9,241
Long-term debt, less unamortized discount and debt issuance costs	0	0
Noncurrent operating lease liabilities	376	415
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Total liabilities not subject to compromise	7,917	9,656
Liabilities subject to compromise	0
Total shareholders' equity	41,392	47,953
Total liabilities and stockholders' equity	49,309	57,609
Parent [Member]
Current assets:
Cash and cash equivalents	7,937	14,461
Restricted cash	998	998
Receivables, net of allowance	157	107
Intercompany receivable (payable)	(26,931)	(28,664)
Inventory	0	0
Assets held for sale	0	0
Prepaid expenses and other current assets	2,452	2,849
Total current assets	(15,387)	(10,249)
Net property and equipment	2,144	2,374
Investments in subsidiaries	508,145	547,123
Deferred income taxes	38,948	44,224
Operating lease assets	2,911	3,114
Other noncurrent assets	1,295	506
Total assets	538,056	587,092
Current liabilities:
Accounts payable	2,373	1,811
Deferred revenues	0	0
Commitment premium	9,584
Debtor in possession financing	4,000
Accrued expenses	6,738	10,570
Total current liabilities	22,695	12,381
Long-term debt, less unamortized discount and debt issuance costs	170,921	467,699
Noncurrent operating lease liabilities	2,583	2,749
Deferred income taxes	0	0
Other noncurrent liabilities	145	187
Total liabilities not subject to compromise	196,344	483,016
Liabilities subject to compromise	306,419
Total shareholders' equity	35,293	104,076
Total liabilities and stockholders' equity	$ 538,056	$ 587,092