Accrual for Loss Contracts Related to Service (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Contractors [Abstract]
Beginning balance		$ 10,050
Change in estimate	$ (1,071)	(1,071)
Reduction for losses realized		(3,559)
Ending balance	$ 5,420	$ 5,420