Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Jul. 14, 2016	Apr. 20, 2016
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets, Net						$ 74,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						1,125
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets						$ 73,667
Intangible assets, net of accumulated amortization of $7,761 and $7,181, respectively	$ 88,187		$ 88,187		$ 89,017		$ 731
Finite-Lived Intangible Assets, Gross	95,948		95,948		96,198
Amortization of Intangible Assets	289	$ 307	580	$ 602
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	0	$ 250	0
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			18 years
Finite-Lived Intangible Assets, Gross	$ 1,125		$ 1,125		1,125
Contract-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			9 years
Finite-Lived Intangible Assets, Gross		$ 731		$ 731	$ 731
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			7 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			15 years