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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 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 |  |  | 37.50% | 38.00% |  |  |  |
Final settlement with tax authority |  |  |  |  |  |  |  | $ 3,700
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 |  |  | $ 59,000 |  |  |  |  |
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 |  |

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