Debt - Interest Expense (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Line of Credit Facility [Line Items]
Amortization of deferred financing costs		$ 283	$ 117	$ 531	$ 234
Interest Expense	[1],[2]	2,452	832	5,897	1,585
Provider Earnout
Line of Credit Facility [Line Items]
Accretion of contingent earnout consideration (included within interest expense)		100		100
Major Earnout
Line of Credit Facility [Line Items]
Accretion of contingent earnout consideration (included within interest expense)		1,400		2,600
Convertible Subordinated Notes
Line of Credit Facility [Line Items]
Interest incurred on convertible subordinated notes to affiliate		0	127	1,052	253
Amortization of discount		0	100	0	100
Working Capital Facility
Line of Credit Facility [Line Items]
Letters of credit fees and commitment fees		193	183	417	375
Working Capital Facility | Senior Credit Facility
Line of Credit Facility [Line Items]
Interest incurred on Senior Credit Facility (1)		543	405	1,237	723
Level 3 | Fair Value, Measurements, Recurring
Line of Credit Facility [Line Items]
Accretion of contingent earnout consideration (included within interest expense)		$ 1,433	$ 0	2,660	$ 0
Level 3 | Fair Value, Measurements, Recurring | Provider Earnout
Line of Credit Facility [Line Items]
Accretion of contingent earnout consideration (included within interest expense)				$ 107

[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" 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 Note 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions" for further discussion.