Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net (loss) income	$ (1,054)	$ 58
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	26,834	23,699
Amortization of debt issuance costs	725	726
Impairment on long-lived assets	1,870	358
Loss on extinguishment of debt	17,550
Deferred income taxes	(1,183)	(734)
Stock-based compensation	3,858	1,593
(Income) loss from unconsolidated affiliates	(1,023)	1,105
Other	210	294
(Gain) loss on sale of property and equipment	(3,324)	328
Changes in operating assets and liabilities:
Accounts receivable and inventories	5,655	(2,046)
Prepaid expenses and other assets	87	(1,017)
Accounts payable	17,790	(2,276)
Accrued expenses and other liabilities	(1,003)	5,035
Earnout payments for acquisitions	(849)
Distributions from unconsolidated affiliates	261	273
Net cash provided by operating activities	66,404	27,396
Cash flows from investing activities:
Purchases of property and equipment	(27,058)	(21,582)
Funding of restricted cash	(493)	(56)
Investment in unconsolidated affiliates	(36)	(5)
Proceeds from sale of property and equipment	4,871	273
Net cash used in investing activities	(22,716)	(21,370)
Debt activities:
Issuance of long-term debt	230,000
Repayments of long-term debt	(223,022)
Debt issuance costs	(7,338)
Repayments of capital lease and long-term financing obligations	(4,174)	(3,423)
Issuance of common stock	65
Proceeds from exercise of stock options	1,111	18
Purchase of treasury stock	(3,476)	(1,483)
Earnout payment for acquisitions	(1,570)
Net cash used in financing activities	(8,404)	(4,888)
Increase in cash and cash equivalents	35,284	1,138
Cash and cash equivalents at beginning of period	97,537	143,867
Cash and cash equivalents at end of period	132,821	145,005
Cash paid during the period for:
Interest	25,905	25,120
Income taxes	595	326
Non-cash investing and financing activities:
Non-cash purchases of property and equipment	$ 2,154	$ 6,306