CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	$ 24,802	$ 114,183	$ (14,322)
Adjustments to reconcile net income (net loss) to net cash provided by operating activities:
Depreciation and amortization	63,449	56,921	28,643
Amortization of debt issuance costs and (premium) discount	3,520	(4,372)	(2,261)
Equity in income of unconsolidated affiliates		(3,460)	(2,705)
Gain on termination of supplemental executive retirement plan assets of unconsolidated affiliate			(715)
Loss on early retirement of debt, net	155	1,937	90
Gain on valuation of unconsolidated affiliate		(35,582)
Distributions from unconsolidated affiliate			509
Change in fair value of acquisition related contingencies	57	90	16
Stock-based compensation expense	3,341	1,488
Loss on sale or disposal of property	836	6	84
Provision (benefit) for bad debt	161	(18)	1,070
Provision (benefit) for deferred income taxes	(11,344)	70,773	(1,583)
Change in operating assets and liabilities:
Restricted cash	2,857	711	(2,273)
Accounts receivable	(4,874)	2,955	358
Inventories	687	(71)	(12)
Prepaid expenses and other	(1,654)	2,094	2,503
Accounts payable	3,183	178	1,811
Interest payable	(344)	(14,112)	18,063
Income taxes payable		(137)	137
Accrued and other liabilities and due to affiliates	(9,950)	4,677	(973)
Net cash provided by operating activities	97,570	56,715	31,606
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures, net of payables	(47,380)	(36,762)	(10,564)
Investment in and loans to unconsolidated affiliate		(1,010)
Net cash (used) acquired in business combinations	(194)	(125,016)	48,110
Proceeds from sale of property and equipment	1,560	153	3
Decrease in restricted cash due to credit support deposit		2,500	2,500
Reimbursement of capital expenditures from West Virginia regulatory authorities	4,207	1,266	799
Decrease (increase) in other assets, net	659	115	(435)
Net cash (used in) provided by investing activities	(41,148)	(158,754)	40,413
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of Senior Notes		375,000
(Payments) proceeds from issuance of Term Loan	(4,250)	425,000
Borrowings under Revolving Credit Facility	73,000	131,000
Payments under Revolving Credit Facility	(137,500)	(37,500)
Principal payments under Senior Notes		(2,125)
Retirement of long-term debt		(728,664)	(13,525)
Principal payments on capital leases	(274)	(88)	(225)
Debt issuance costs	(4,288)	(25,820)
Call premium on early retirement of debt		(44,090)
Taxes paid related to net share settlement of equity awards	(744)		(148)
Cash distributions			(575)
Proceeds from exercise of stock options	385		245
Net cash (used in) provided by financing activities	(73,671)	92,713	(14,228)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(17,249)	(9,326)	57,791
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	78,278	87,604	29,813
CASH AND CASH EQUIVALENTS, END OF YEAR	61,029	78,278	87,604
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	47,696	78,378	14,848
Local income taxes paid	1,662	1,198	360
Noncash distribution of Tamarack investment			5,479
Payables for capital expenditures	$ 4,222	500	$ 3,890
Equipment acquired under capital leases		$ 870