Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015
Loss Contingencies [Line Items]
Assets	$ 2,076,839	$ 2,061,866
Contract Matters with Triumph [Member]
Loss Contingencies [Line Items]
Charge related to a contract termination dispute			$ 2,788
Assets		8,000
Damages sought	18,000	$ 15,000
Triumph Counterclaim [Member]
Loss Contingencies [Line Items]
Damages sought	$ 23,000