Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 31,875	$ 86,939
Accounts and notes receivable, net of allowance of $1,082 and $571 as of December 31, 2014 and December 31, 2013, respectively	80,321	58,274
Inventory, net	5,971us-gaap_InventoryNet	5,302us-gaap_InventoryNet
Restricted cash	20,427	14,896
Current portion of deferred tax asset, net	24,303us-gaap_DeferredTaxAssetsNetCurrent	21,202us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses, deferred costs, and other current assets	34,508	20,159
Total current assets	197,405us-gaap_AssetsCurrent	206,772us-gaap_AssetsCurrent
Property and equipment, net	335,795us-gaap_PropertyPlantAndEquipmentNet	270,966us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net	177,540	155,276
Goodwill	511,963us-gaap_Goodwill	404,491us-gaap_Goodwill
Deferred tax asset, net	10,487us-gaap_DeferredTaxAssetsNetNoncurrent	9,680us-gaap_DeferredTaxAssetsNetNoncurrent
Prepaid expenses, deferred costs, and other noncurrent assets	22,600	9,018
Total assets	1,255,790us-gaap_Assets	1,056,203us-gaap_Assets
Current liabilities:
Current portion of long-term debt	35us-gaap_LongTermDebtCurrent	1,289us-gaap_LongTermDebtCurrent
Current portion of other long-term liabilities	34,937us-gaap_OtherLiabilitiesCurrent	35,597us-gaap_OtherLiabilitiesCurrent
Accounts payable	35,984us-gaap_AccountsPayableCurrent	38,981us-gaap_AccountsPayableCurrent
Accrued liabilities	179,966us-gaap_AccruedLiabilitiesCurrent	137,776us-gaap_AccruedLiabilitiesCurrent
Current portion of deferred tax liability, net		1,152us-gaap_DeferredTaxLiabilitiesCurrent
Total current liabilities	250,922us-gaap_LiabilitiesCurrent	214,795us-gaap_LiabilitiesCurrent
Long-term liabilities:
Long-term debt	612,662us-gaap_LongTermDebtNoncurrent	489,225us-gaap_LongTermDebtNoncurrent
Asset retirement obligation	52,039	60,665
Deferred tax liability, net	15,916	5,668
Other long-term liabilities	37,716us-gaap_OtherLiabilitiesNoncurrent	38,736us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	969,255us-gaap_Liabilities	809,089us-gaap_Liabilities
Commitments and contingencies
Stockholders' equity:
Common stock, $0.0001 par value; 125,000,000 shares authorized; 51,596,360 and 51,207,849 shares issued as of December 31, 2014 and December 31, 2013, respectively; 44,562,122 and 44,375,952 shares outstanding as of December 31, 2014 and December 31, 2013, respectively	5us-gaap_CommonStockValue	5us-gaap_CommonStockValue
Additional paid-in capital	352,166	330,862
Accumulated other comprehensive loss, net	(83,007)	(72,954)
Retained earnings	118,817	81,677
Treasury stock; 7,034,238 and 6,831,897 shares at cost as of December 31, 2014 and December 31, 2013, respectively	(97,835)us-gaap_TreasuryStockValue	(90,679)us-gaap_TreasuryStockValue
Total parent stockholders' equity	290,146us-gaap_StockholdersEquity	248,911us-gaap_StockholdersEquity
Noncontrolling interests	(3,611)us-gaap_MinorityInterest	(1,797)us-gaap_MinorityInterest
Total stockholders' equity	286,535	247,114
Total liabilities and stockholders' equity	$ 1,255,790	$ 1,056,203

The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

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