Summary of Significant Accounting Policies (Amortization Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of intangible assets subject to amortization	$ 105,835	$ 104,168
Intangible assets subject to amortization, net	71,173us-gaap_FiniteLivedIntangibleAssetsNet	77,555us-gaap_FiniteLivedIntangibleAssetsNet
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of intangible assets subject to amortization	88,576	87,139
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of intangible assets subject to amortization	13,223	13,004
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of intangible assets subject to amortization	1,939	1,939
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of intangible assets subject to amortization	2,097	2,086
Less accumulated amortization	$ 34,662	$ 26,613

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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