The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Intangible assets
Total	$ 37,930		$ 39,581
Amortization expense of intangible assets	1,651us-gaap_AmortizationOfIntangibleAssets	1,843us-gaap_AmortizationOfIntangibleAssets
Estimated future amortization expense for intangible assets
2015 (remaining nine months)	4,746
2016	5,980
2017	5,703
2018	5,239
2019	3,388
Thereafter	12,874
Tradename
Intangible assets
Total	17,354		18,194
Tradename \| Minimum
Intangible assets
Amortization Period	3 years
Tradename \| Maximum
Intangible assets
Amortization Period	10 years
Non-compete agreements
Intangible assets
Total	900		1,074
Non-compete agreements \| Minimum
Intangible assets
Amortization Period	2 years
Non-compete agreements \| Maximum
Intangible assets
Amortization Period	5 years
Customer relationship
Intangible assets
Total	$ 19,676		$ 20,313
Customer relationship \| Minimum
Intangible assets
Amortization Period	5 years
Customer relationship \| Maximum
Intangible assets
Amortization Period	15 years