Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Cash flows from operating activities:
Net income	$ 70,146	[1]	$ 41,133	[2]	$ 5,771
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, accretion, and amortization expense	65,876		58,195		58,336
Amortization of deferred financing costs and bond discounts	993		2,029		2,395
Write-off of deferred financing costs and bond discounts			7,296
Redemption costs for early extinguishment of debt			7,193
Stock-based compensation expense	9,324		6,037		4,620
Deferred income taxes	(14,864)		(18,737)		3,729
Loss on disposal of assets	981		2,647		6,016
Unrealized (gain) loss on derivative instruments	(1,086)		(972)		1,437
Amortization of accumulated other comprehensive losses associated with derivative instruments no longer designated as hedging instruments	170		1,573
Other reserves and non-cash items	111		926		(4,517)
Changes in assets and liabilities:
(Increase) decrease in accounts and notes receivable, net	(17,730)		7,056		(2,426)
(Increase) decrease in prepaid, deferred costs, and other current assets	(615)		(2,211)		7,255
Increase in inventory	(2,264)				(1,111)
(Increase) decrease in other assets	(17,865)		2,094		1,710
Increase (decrease) in accounts payable	4,556		6,384		(3,923)
Increase (decrease) in accrued liabilities	19,804		(9,751)		166
Decrease in other liabilities	(4,212)		(5,724)		(4,584)
Net cash provided by operating activities	113,325		105,168		74,874
Cash flows from investing activities:
Additions to property and equipment	(64,418)		(48,069)		(25,770)
Payments for exclusive license agreements, site acquisition costs and other intangible assets	(2,468)		(2,583)		(261)
Acquisitions, net of cash acquired	(167,568)
Net cash used in investing activities	(234,454)		(50,652)		(26,031)
Cash flows from financing activities:
Proceeds from borrowings of long-term debt	381,738		382,400		55,882
Repayments of long-term debt and capital leases	(264,991)		(445,840)		(99,212)
(Repayments of) proceeds from borrowings under bank overdraft facility, net	(830)		995		(142)
Debt issuance and modification costs	(655)		(5,423)		(458)
Payments received on subscriptions receivable					34
Proceeds from exercises of stock options	11,420		7,390		1,596
Noncontrolling interest stockholder capital contributions					526
Repurchase of capital stock	(3,150)		(1,672)		(458)
Net cash provided by (used in) financing activities	123,532		(62,150)		(42,232)
Effect of exchange rate changes on cash	(16)		374		414
Net increase (decrease) in cash and cash equivalents	2,387		(7,260)		7,025
Cash and cash equivalents as of beginning of period	3,189		10,449		3,424
Cash and cash equivalents as of end of period	5,576		3,189		10,449
Supplemental disclosure of cash flow information:
Cash paid for interest, including interest on capital leases	20,355		29,830		30,470
Cash paid for income taxes	1,844		831		300
Capital expenditures financed by direct debt			$ 542		$ 2,499

[1] Includes $37.0 million of tax benefit recorded in the quarter ended September 30 as a result of a tax reporting change with respect to the Company's U.K. operations.

[2] Includes release of $23.7 million and $3.5 million in previously-recognized valuation allowances related to the Company's United States segment for the quarters ended September 30 and December 31, respectively. Additionally, the quarter ended September 30 includes pre-tax charges of approximately $14.5 million related to certain charges associated with the refinancing of the Company's outstanding debt obligations.