Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 62,951	$ 51,158
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, accretion, and amortization of intangible assets	97,214	93,182
Amortization of deferred financing costs and note discount	8,636	8,455
Stock-based compensation expense	15,780	14,263
Deferred income taxes	15,731	2,233
Gain on disposal of assets	(475)	(12,425)
Other reserves and non-cash items	686	2,680
Changes in assets and liabilities:
Increase in accounts and notes receivable, net	(4,122)	(1,621)
Increase in prepaid expenses, deferred costs, and other current assets	(7,142)	(4,373)
Increase in inventory, net	(360)	(4,915)
Increase in other assets	(6,585)	(6,832)
Increase (decrease) in accounts payable	5,126	(8,402)
Increase in accrued liabilities	24,151	10,832
Increase in other liabilities	2,340	2,877
Net cash provided by operating activities	213,931	147,112
Cash flows from investing activities:
Additions to property and equipment	(76,050)	(103,877)
Acquisitions, net of cash acquired	(19,701)	(103,874)
Proceeds from sale of assets and businesses	9,348	36,661
Net cash used in investing activities	(86,403)	(171,090)
Cash flows from financing activities:
Proceeds from borrowings under revolving credit facility	221,268	340,250
Repayments of borrowings under revolving credit facility	(311,361)	(324,216)
Proceeds from exercises of stock options	579	586
Additional tax benefit related to stock-based compensation	338	1,287
Repurchase of capital stock	(3,959)	(4,610)
Net cash (used in) provided by financing activities	(93,135)	13,297
Effect of exchange rate changes on cash	(1,169)	(2,711)
Net decrease in cash and cash equivalents	33,224	(13,392)
Cash and cash equivalents as of beginning of period	26,297	31,875
Cash and cash equivalents as of end of period	59,521	18,483
Supplemental disclosure of cash flow information:
Cash paid for interest	13,832	17,345
Cash paid for income taxes	$ 9,499	$ 19,411