Guarantor/Non Guarantor Condensed Consolidated Financial Statements (Balance Sheet (Unaudited)) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 14,160	$ 34,924	$ 27,385		$ 23,733
Receivables, net of allowance	79,816	190,201
Intercompany receivable (payable)	0	0
Deferred income taxes	0	10,998
Inventory	9,262	14,117
Assets held for sale	4,619	9,909
Prepaid expenses and other current assets	7,411	8,925
Total current assets	115,268	269,074
Net property and equipment	702,585	856,541
Investments in subsidiaries	0	0
Intangible assets, net of accumulated amortization	1,944	24,223
Goodwill				$ 0
Noncurrent deferred income taxes	18	2,753
Other long-term assets	9,961	18,998
Total assets	829,776	1,171,589	1,229,623
Current liabilities:
Accounts payable	16,951	64,305
Current portion of long-term debt	0	27
Deferred revenues	6,222	3,315
Accrued expenses	46,869	79,545
Total current liabilities	70,042	147,192
Long-term debt, less current portion	395,000	455,053
Noncurrent deferred income taxes	17,520	69,578
Other long-term liabilities	4,571	4,702
Total liabilities	487,133	676,525
Total shareholders' equity	342,643	495,064	518,433		547,680
Total liabilities and shareholders' equity	829,776	1,171,589
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	(5,612)	(5,516)	(2,059)		(5,401)
Receivables, net of allowance	67,174	151,048
Intercompany receivable (payable)	31,108	55,567
Deferred income taxes		8,196
Inventory	5,591	7,208
Assets held for sale	4,619	9,909
Prepaid expenses and other current assets	4,767	6,554
Total current assets	107,647	232,966
Net property and equipment	667,321	763,994
Investments in subsidiaries	42,240	116,799
Intangible assets, net of accumulated amortization	1,944	24,223
Noncurrent deferred income taxes	0	0
Other long-term assets	962	1,955
Total assets	820,114	1,139,937
Current liabilities:
Accounts payable	14,628	57,910
Current portion of long-term debt		27
Deferred revenues	5,570	3,315
Accrued expenses	37,023	64,063
Total current liabilities	57,221	125,315
Long-term debt, less current portion	0	53
Noncurrent deferred income taxes	102,509	160,104
Other long-term liabilities	3,294	3,658
Total liabilities	163,024	289,130
Total shareholders' equity	657,090	850,807
Total liabilities and shareholders' equity	820,114	1,139,937
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	2,551	12,752	1,076		10,655
Receivables, net of allowance	12,814	37,512
Intercompany receivable (payable)	(6,272)	(30,728)
Deferred income taxes		975
Inventory	3,671	6,909
Assets held for sale	0	0
Prepaid expenses and other current assets	1,444	1,154
Total current assets	14,208	28,574
Net property and equipment	31,953	89,118
Investments in subsidiaries	0	0
Intangible assets, net of accumulated amortization	0	0
Noncurrent deferred income taxes	18	2,753
Other long-term assets	704	6,921
Total assets	46,883	127,366
Current liabilities:
Accounts payable	1,707	5,660
Current portion of long-term debt		0
Deferred revenues	652	0
Accrued expenses	1,719	4,376
Total current liabilities	4,078	10,036
Long-term debt, less current portion	0	0
Noncurrent deferred income taxes	0	0
Other long-term liabilities	565	531
Total liabilities	4,643	10,567
Total shareholders' equity	42,240	116,799
Total liabilities and shareholders' equity	46,883	127,366
Eliminations [Member]
Current assets:
Cash and cash equivalents	0	0	0		0
Receivables, net of allowance	(246)	0
Intercompany receivable (payable)	0	(3)
Deferred income taxes		0
Inventory	0	0
Assets held for sale	0	0
Prepaid expenses and other current assets	0	0
Total current assets	(246)	(3)
Net property and equipment	0	(750)
Investments in subsidiaries	(699,330)	(967,606)
Intangible assets, net of accumulated amortization	0	0
Noncurrent deferred income taxes	(84,014)	(90,664)
Other long-term assets	0	0
Total assets	(783,590)	(1,059,023)
Current liabilities:
Accounts payable	0	0
Current portion of long-term debt		0
Deferred revenues	0	0
Accrued expenses	(246)	(3)
Total current liabilities	(246)	(3)
Long-term debt, less current portion	0	0
Noncurrent deferred income taxes	(84,014)	(90,664)
Other long-term liabilities	0	0
Total liabilities	(84,260)	(90,667)
Total shareholders' equity	(699,330)	(968,356)
Total liabilities and shareholders' equity	(783,590)	(1,059,023)
Parent [Member]
Current assets:
Cash and cash equivalents			28,368		$ 18,479
Parent [Member]
Current assets:
Cash and cash equivalents	17,221	27,688	$ 28,368
Receivables, net of allowance	74	1,641
Intercompany receivable (payable)	(24,836)	(24,836)
Deferred income taxes		1,827
Inventory	0	0
Assets held for sale	0	0
Prepaid expenses and other current assets	1,200	1,217
Total current assets	(6,341)	7,537
Net property and equipment	3,311	4,179
Investments in subsidiaries	657,090	850,807
Intangible assets, net of accumulated amortization	0	0
Noncurrent deferred income taxes	84,014	90,664
Other long-term assets	8,295	10,122
Total assets	746,369	963,309
Current liabilities:
Accounts payable	616	735
Current portion of long-term debt		0
Deferred revenues	0	0
Accrued expenses	8,373	11,109
Total current liabilities	8,989	11,844
Long-term debt, less current portion	395,000	455,000
Noncurrent deferred income taxes	(975)	138
Other long-term liabilities	712	513
Total liabilities	403,726	467,495
Total shareholders' equity	342,643	495,814
Total liabilities and shareholders' equity	$ 746,369	$ 963,309