Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 22,905	$ 23,913
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, accretion, and amortization of intangible assets	54,625	43,995
Amortization of deferred financing costs and note discount	5,447	460
Stock-based compensation expense	6,917	5,744
Deferred income taxes	(2,734)	3,584
Loss on disposal of assets	584	360
Other reserves and non-cash items	1,693	2,689
Changes in assets and liabilities:
Increase in accounts and notes receivable, net	(5,308)	(3,538)
(Increase) decrease in prepaid, deferred costs, and other current assets	(8,131)	9,945
Increase in inventory	(2,510)	(1,649)
Decrease (increase) in other assets	3,460	(1,327)
(Decrease) increase in accounts payable	(16,322)	2,398
Decrease in accrued liabilities	(2,623)	(1,532)
Decrease in other liabilities	(1,132)	(4,688)
Net cash provided by operating activities	56,871	80,354
Cash flows from investing activities:
Additions to property and equipment	(41,753)	(26,422)
Payments for exclusive license agreements, site acquisition costs and other intangible assets		(3,433)
Acquisitions, net of cash acquired	(8,805)	(29,610)
Net cash used in investing activities	(50,558)	(59,465)
Cash flows from financing activities:
Proceeds from borrowings of long-term debt		85,600
Repayments of long-term debt and capital leases	(22,991)	(104,846)
Repayments of borrowings under bank overdraft facility, net	(1,534)
Debt issuance and modification costs	(2,676)
Payment of contingent acquisition consideration	(518)	(750)
Proceeds from exercises of stock options	141	459
Excess tax benefit from stock-based compensation expense	1,998	10,832
Repurchase of capital stock	(6,145)	(3,821)
Net cash used in financing activities	(31,725)	(12,526)
Effect of exchange rate changes on cash	(163)	117
Net (decrease) increase in cash and cash equivalents	(25,575)	8,480
Cash and cash equivalents as of beginning of period	86,939	13,861
Cash and cash equivalents as of end of period	61,364	22,341
Supplemental disclosure of cash flow information:
Cash paid for interest, including interest on capital leases	11,645	10,132
Cash paid for income taxes	$ 18,114	$ 2,550