Commitments and Contingencies (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) facility	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Rent expenses	$ 2.6	$ 2.6	$ 2.4
Number of repair facilities with labor union collective bargaining agreements | facility	2
Gain Contingency, Unrecorded Amount	$ 25.0
Loss Contingency, Damages Sought, Value	$ 10.0