Debt and Commitments (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Interest Paid	$ 10,550	$ 10,471	$ 11,636
Interest Capitalized	$ 422	$ 359	$ 247