Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 2,947	$ 3,570	$ 5,801	$ 7,442
Effective tax rate (as a percent)	31.60%	36.10%	27.80%	35.80%
Federal statutory rate (as a percent)			35.00%
Release of valuation allowance due to anticipated effects of the use of capital loss carryforwards	$ 716		$ 716
Reduction in income tax expense	$ 364		$ 364
Operating Loss Carryforwards [Line Items]
Reduction in effective tax rate due to state tax credits and valuation allowance (as a percent)	4.50%		8.00%
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 10		$ 10
ICP
Operating Loss Carryforwards [Line Items]
Equity method ownership percentage (percent)	30.00%		30.00%