Summary of Significant Accounting Policies (Amortization Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of intangible assets subject to amortization	$ 109,742	$ 105,835
Less accumulated amortization	42,997	34,662
Amortization Expense	66,745	71,173
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of intangible assets subject to amortization	92,660	88,576
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of intangible assets subject to amortization	13,057	13,223
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	$ 2,086	$ 2,097