Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2009	Apr. 30, 2016
Income Tax Disclosure [Line Items]
Net increase from the reevaluation of uncertain tax positions arising in examinations	$ 0
Net decrease from the reevaluation of uncertain tax positions arising in examinations	$ 2,300
Income Tax Expense Benefit Estimated Tax Rate	39.70%			40.00%
Earliest Tax Year [Member]
Income Tax Disclosure [Line Items]
Open tax years	2007
Latest Tax Year [Member]
Income Tax Disclosure [Line Items]
Open tax years	2015
Scenario, Plan [Member]
Income Tax Disclosure [Line Items]
Foreign Earnings Repatriated	$ 59,400
Subsequent Event [Member]
Income Tax Disclosure [Line Items]
Final settlement with tax authority								$ 3,700
Federal Ministry of Finance, Germany [Member]
Income Tax Disclosure [Line Items]
Payment to taxing authority to pursue litigation							$ 14,500
Recognized current and deferred tax benefits	$ 500
Adjustment of certain deferred tax assets		$ 600	$ 5,800		$ 6,400	$ 6,300