Description of the Business and Summary of Significant Accounting Policies - Deferred Financing Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest Expense, Debt [Abstract]
Amortization of deferred financing costs	$ 5,632	$ 5,350	$ 4,863
Gain (Loss) on Extinguishment of Debt [Abstract]
Write-off of deferred financing costs	1,956	925
Interest Expense [Member]
Gain (Loss) on Extinguishment of Debt [Abstract]
Write-off of deferred financing costs	$ 2,000	$ 900