Chapter 11 Cases and Subsequent Events Debtor Condensed Combined Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Entity Information [Line Items]
Cash and cash equivalents	$ 15,457	$ 24,619
Restricted cash	998	998
Receivables, net of allowance	102,923	123,526
Intercompany receivable, net	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
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
Stockholders' equity	35,293	104,076	$ 150,967	$ 165,058
Total liabilities and stockholders' equity	615,734	$ 673,954
Debtor Entities in Bankruptcy [Member]
Entity Information [Line Items]
Cash and cash equivalents	7,938
Restricted cash	998
Receivables, net of allowance	84,674
Intercompany receivable, net	32,599
Inventory	9,530
Assets held for sale	1,825
Prepaid expenses and other current assets	7,127
Total current assets	144,691
Net property and equipment	412,711
Investments in subsidiaries	549,536
Deferred income taxes	38,948
Operating lease assets	7,441
Other noncurrent assets	1,754
Total assets	1,155,081
Accounts payable	23,166
Deferred revenues	428
Commitment premium	9,584
Debtor in possession financing	4,000
Accrued expenses	48,480
Total current liabilities	85,658
Long-term debt, less unamortized discount and debt issuance costs	170,921
Noncurrent operating lease liabilities	6,058
Deferred income taxes	42,204
Other noncurrent liabilities	383
Total liabilities not subject to compromise	305,224
Liabilities subject to compromise	306,419
Stockholders' equity	543,438
Total liabilities and stockholders' equity	$ 1,155,081