Fair Value Measurements - Fair Value Measurements Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in Fair Value of Earnout liabilities			$ (2,568)	[1]	$ 1,000	[2]
Provider Earnout
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accretion of contingent earnout consideration (included within interest expense)	$ 100		100
Fair Value, Measurements, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent payment arrangement, beginning			22,653
Contingent payment arrangement, ending	9,842		9,842
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent payment arrangement, beginning			22,653
Change in Fair Value of Earnout liabilities			(2,568)
Accretion of contingent earnout consideration (included within interest expense)	1,433	$ 0	2,660		$ 0
Payments			(12,903)
Contingent payment arrangement, ending	9,842		9,842
Fair Value, Measurements, Recurring | Level 3 | Major Earnout And Stock Earnout [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent payment arrangement, beginning			17,760
Change in Fair Value of Earnout liabilities			(3,068)
Accretion of contingent earnout consideration (included within interest expense)			2,553
Payments			(7,403)
Contingent payment arrangement, ending	$ 9,842		9,842
Fair Value, Measurements, Recurring | Level 3 | Provider Earnout
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent payment arrangement, beginning			4,893
Change in Fair Value of Earnout liabilities			500
Accretion of contingent earnout consideration (included within interest expense)			107
Payments			$ (5,500)

[1] Financial information has been recast to include results attributable to the acquisition of Perigee Energy, LLC by an affiliate on February 3, 2017. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.

[2] Financial information has been recast to include results attributable to the acquisition of the Major Energy Companies by an affiliate on April 15, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.