Basis of Presentation and Significant Accounting Policies Allowance for obsolete inventory (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Balance, beginning of year	$ 19,513	$ 9,579	$ 10,013
Provision for obsolete inventory	29,848	12,061	2,331
Less Charges against allowance	(35,584)	(2,127)	(2,765)
Balance, end of year	$ 13,777	$ 19,513	$ 9,579