Income Taxes - Allocation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense on continuing operations	$ 2,840	$ 27,726	$ 22,151
Shareholders’ equity, for compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes	0	(679)	(395)
Other comprehensive income for changes in cash flow hedge	4,162	(476)	(993)
Income tax expense	$ 7,002	$ 26,571	$ 20,763