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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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Intangible assets
Total	$ 39,860		$ 39,860		$ 39,581
Amortization expense of intangible assets	1,719	$ 1,843	3,370	$ 3,687
Estimated future amortization expense for intangible assets
2015 (remaining six months)	3,405		3,405
2016	6,460		6,460
2017	6,201		6,201
2018	5,719		5,719
2019	5,509		5,509
Thereafter	12,566		12,566
Tradename
Intangible assets
Total	16,582		$ 16,582		18,194
Tradename \| Minimum
Intangible assets
Amortization Period			3 years
Tradename \| Maximum
Intangible assets
Amortization Period			10 years
Non-compete agreements
Intangible assets
Total	1,853		$ 1,853		1,074
Non-compete agreements \| Minimum
Intangible assets
Amortization Period			2 years
Non-compete agreements \| Maximum
Intangible assets
Amortization Period			5 years
Customer relationships
Intangible assets
Total	$ 21,425		$ 21,425		$ 20,313
Customer relationships \| Minimum
Intangible assets
Amortization Period			5 years
Customer relationships \| Maximum
Intangible assets
Amortization Period			15 years