Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2016
Loss Contingencies [Line Items]
Assets	$ 2,061,866		$ 2,221,883
Contract Matters with Triumph [Member]
Loss Contingencies [Line Items]
Charge related to a contract termination dispute		$ 2,788
Assets			8,000
Damages sought	$ 15,000		12,000
Triumph Counterclaim [Member]
Loss Contingencies [Line Items]
Damages sought			$ 23,000