Operations and Summary of Significant Accounting Policies - Sales Office Closing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 2,400
Cash payments	2,250
Accelerated depreciation	200
Restructuring Reserve [Abstract]
Balance at December 31, 2014	0
Charges	2,903
Cash payments	2,250
Balance at December 31, 2015	653
Estimated remaining restructuring charges	300
Remaining estimated future minimum lease obligations	500
Amounts reclassified from accumulative other comprehensive income, net of tax	0	$ 2,794
Operating Leases Obligation
Restructuring Cost and Reserve [Line Items]
Cash payments	751
Restructuring Reserve [Abstract]
Balance at December 31, 2014	0
Charges	751
Cash payments	751
Balance at December 31, 2015	0
Employee Severance Obligation
Restructuring Cost and Reserve [Line Items]
Cash payments	2,121
Restructuring Reserve [Abstract]
Balance at December 31, 2014	0
Charges	2,422
Cash payments	2,121
Balance at December 31, 2015	301
Other Associated Costs
Restructuring Cost and Reserve [Line Items]
Cash payments	129
Restructuring Reserve [Abstract]
Balance at December 31, 2014	0
Charges	481
Cash payments	129
Balance at December 31, 2015	352
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 600