Incentive Compensation Plans (Cash Incentive Plan) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Accrued employment costs	$ 3,256	$ 6,011
Cash Incentive Plans [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Other Labor-related Expenses	1,000	4,400	$ 1,000
Accrued employment costs	608	3,300
Cash Incentive Plans [Member] | Cost of Sales [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Other Labor-related Expenses	$ 404	$ 1,800	$ 576