Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Taxes [Abstract]
Effective tax rate	34.30%	73.20%		35.80%	23.00%
Income tax expense	$ 10,403	$ 13,126		$ 29,334	$ 13,126
Pre-tax income from continuing operations	30,289	17,925		$ 81,941	57,093
Incremental tax expense due to release of valuation allowance			$ 15,600
Income tax benefit from reversal of deferred tax asset valuation allowance		$ 9,600			$ 9,600
Income tax uncertainties [Abstract]
Open tax year				2014
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	97,200			$ 97,200
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	146,800			146,800
Foreign [Member]
Tax Credit Carryforward [Line Items]
Tax credits	$ 9,700			$ 9,700