Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 20,647	$ 43,262	$ 70,146
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, accretion, and amortization expense	95,816	83,211	65,876
Amortization of deferred financing costs and note discount	1,931	896	993
Stock-based compensation expense	12,324	11,110	9,324
Deferred income taxes	8,533	25,694	(14,864)
Loss on disposal of assets	2,790	1,787	981
Other reserves and non-cash items	4,812	1,786	(805)
Changes in assets and liabilities:
Increase in accounts and notes receivable, net	(11,087)	(3,564)	(17,730)
Decrease (increase) in prepaid, deferred costs, and other current assets	15,504	(18,922)	(615)
Increase in inventory	(1,943)	(2,436)	(2,264)
(Increase) decrease in other assets	(1,503)	18,487	(17,865)
Increase (decrease) in accounts payable	12,804	(12,409)	4,556
Increase (decrease) in accrued liabilities	29,722	(6,203)	19,804
Decrease in other liabilities	(6,793)	(6,311)	(4,212)
Net cash provided by operating activities	183,557	136,388	113,325
Cash flows from investing activities:
Additions to property and equipment	(71,562)	(89,579)	(64,418)
Payments for exclusive license agreements, site acquisition costs and other intangible assets	(5,591)	(3,224)	(2,468)
Acquisitions, net of cash acquired	(189,587)	(20,961)	(167,568)
Net cash used in investing activities	(266,740)	(113,764)	(234,454)
Cash flows from financing activities:
Proceeds from borrowings of long-term debt	311,277	245,100	381,738
Repayments of long-term debt and capital leases	(397,667)	(261,596)	(264,991)
Repayments of borrowings under bank overdraft facility, net		(162)	(830)
Proceeds from issuance of convertible notes	287,500
Proceeds from issuance of warrants	40,509
Purchase of convertible note hedges	(72,565)
Debt issuance and modification costs	(7,540)		(655)
Payment of contingent acquisition consideration	(750)
Proceeds from exercises of stock options	2,626	7,344	11,420
Excess tax benefit from stock-based compensation expense	24,007
Repurchase of capital stock	(32,409)	(4,770)	(3,150)
Net cash provided by (used in) financing activities	154,988	(14,084)	123,532
Effect of exchange rate changes on cash	1,273	(255)	(16)
Net increase in cash and cash equivalents	73,078	8,285	2,387
Cash and cash equivalents as of beginning of period	13,861	5,576	3,189
Cash and cash equivalents as of end of period	86,939	13,861	5,576
Supplemental disclosure of cash flow information:
Cash paid for interest, including interest on capital leases	20,831	21,250	20,355
Cash paid for income taxes	$ 4,031	$ 3,049	$ 1,844