Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Income taxes paid	$ (10,587)	$ 4,909	$ 36,783
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount	6,000
Tax credit	1,100	0
Deferred Other Tax Expense (Benefit)	2,600
Other Tax Expense (Benefit)	800
Decrease in in unrecognized tax benefits, reasonably possible	1,100
Penalties and interest liabilities	400	600
Penalties and interest expense	200	100
Deferred Income Tax Expense (Benefit)	6,029	$ 2,533	$ 21,815
Expiration Begins, 2035
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	4,000
Expiration Begins, 2017
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	66,900
Expiration Begins, 2031
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	100
Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Deferred Income Tax Expense (Benefit)	$ 1,800