Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (32,624)us-gaap_NetIncomeLoss	$ (1,907)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	60,929	51,705
Accretion on asset retirement obligation	33	31
Change in allowance for doubtful accounts	(457)	(371)
Amortization of deferred financing costs	743us-gaap_AmortizationOfFinancingCosts	799us-gaap_AmortizationOfFinancingCosts
Amortization of premium on notes	(62)	(58)
Non-cash compensation	3,969	3,387
(Gain) loss on disposal of assets	48us-gaap_GainLossOnDispositionOfAssets	(679)us-gaap_GainLossOnDispositionOfAssets
Deferred income taxes	(17,885)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,197)us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	88,781	(16,011)
Inventories	4,788us-gaap_IncreaseDecreaseInInventories	(1,308)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(2,116)	(6,703)
Other assets	(25)	562
Accounts payable	(16,903)	5,206
Income tax receivable / payable	1,791	578
Other liabilities	(65)	639
Accrued expenses	(25,168)	(6,106)
Net cash provided by operating activities	65,777	28,567
Cash flows from investing activities:
Purchase of property and equipment	(25,861)	(33,106)
Proceeds from sale of assets	3,261	23,297
Payments for other long-term assets		(363)
Net cash used in investing activities	(22,600)	(10,172)
Cash flows from financing activities:
Payments of debt	(14,358)us-gaap_RepaymentsOfLongTermDebt	(11,124)us-gaap_RepaymentsOfLongTermDebt
Purchase of treasury stock	(4,490)	(6,244)
Tax withholding from exercise of stock options	(3)	(362)
Exercise of employee stock options	727	4,441
Deferred loan costs and other financing activities	(32)	(11)
Net cash used in financing activities	(18,156)	(13,300)
Net increase in cash and equivalents	25,021	5,095
Cash and cash equivalents - beginning of period	79,915	111,532
Cash and cash equivalents - end of period	$ 104,936	$ 116,627

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Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration