Guarantor/Non Guarantor Condensed Consolidated Financial Statements (Cash Flows (Unaudited)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities:	$ (21,820)	$ 9,627
Cash flows from investing activities:
Purchases of property and equipment	(24,683)	(5,532)
Proceeds from sale of property and equipment	7,148	477
Proceeds from insurance recoveries	3,119	0
Net cash provided by (used in) investing activities	(14,416)	(5,055)
Cash flows from financing activities:
Debt repayments	(6,305)	0
Proceeds from issuance of debt	40,000	0
Debt issuance costs	0	(20)
Purchase of treasury stock	(363)	(43)
Intercompany contributions / distributions	0	0
Net cash provided by (used in) financing activities	33,332	(63)
Net increase (decrease) in cash and cash equivalents	(2,904)	4,509
Beginning cash and cash equivalents	10,194	14,160
Ending cash and cash equivalents	7,290	18,669
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities:	0	0
Cash flows from investing activities:
Purchases of property and equipment	270	0
Proceeds from sale of property and equipment	(270)	0
Proceeds from insurance recoveries	0
Net cash provided by (used in) investing activities	0	0
Cash flows from financing activities:
Debt repayments	0
Proceeds from issuance of debt		0
Debt issuance costs		0
Purchase of treasury stock	0	0
Intercompany contributions / distributions	0	0
Net cash provided by (used in) financing activities	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Beginning cash and cash equivalents	0	0
Ending cash and cash equivalents	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities:	(8,233)	24,998
Cash flows from investing activities:
Purchases of property and equipment	(24,013)	(5,424)
Proceeds from sale of property and equipment	7,387	432
Proceeds from insurance recoveries	3,119
Net cash provided by (used in) investing activities	(13,507)	(4,992)
Cash flows from financing activities:
Debt repayments	0
Proceeds from issuance of debt	0
Debt issuance costs		0
Purchase of treasury stock	0	0
Intercompany contributions / distributions	21,653	(14,242)
Net cash provided by (used in) financing activities	21,653	(14,242)
Net increase (decrease) in cash and cash equivalents	(87)	5,764
Beginning cash and cash equivalents	(764)	(5,612)
Ending cash and cash equivalents	(851)	152
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities:	649	212
Cash flows from investing activities:
Purchases of property and equipment	(813)	(40)
Proceeds from sale of property and equipment	31	45
Proceeds from insurance recoveries	0
Net cash provided by (used in) investing activities	(782)	5
Cash flows from financing activities:
Debt repayments	0
Proceeds from issuance of debt	0
Debt issuance costs		0
Purchase of treasury stock	0	0
Intercompany contributions / distributions	(55)	(33)
Net cash provided by (used in) financing activities	(55)	(33)
Net increase (decrease) in cash and cash equivalents	(188)	184
Beginning cash and cash equivalents	1,060	2,551
Ending cash and cash equivalents	872	2,735
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities:	(14,236)	(15,583)
Cash flows from investing activities:
Purchases of property and equipment	(127)	(68)
Proceeds from sale of property and equipment	0	0
Proceeds from insurance recoveries	0
Net cash provided by (used in) investing activities	(127)	(68)
Cash flows from financing activities:
Debt repayments	(6,305)
Proceeds from issuance of debt	40,000
Debt issuance costs		(20)
Purchase of treasury stock	(363)	(43)
Intercompany contributions / distributions	(21,598)	14,275
Net cash provided by (used in) financing activities	11,734	14,212
Net increase (decrease) in cash and cash equivalents	(2,629)	(1,439)
Beginning cash and cash equivalents	9,898	17,221
Ending cash and cash equivalents	$ 7,269	$ 15,782