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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018	Jan. 01, 2017
Accounting Policies [Line Items]
Amount of transfers between levels within the fair value hierarchy	$ 0	$ 0
Cumulative effect of adoption			$ 23,123,000	$ 14,508,000
Accumulated earnings	$ (694,129,000)		(733,972,000)
Expected increase in operating lease assets and lIabilities as percent of total assets	1.00%
Minimum
Accounting Policies [Line Items]
Useful life	1 year
Useful life	1 year
Maximum
Accounting Policies [Line Items]
Useful life	40 years
Useful life	30 years
Software Development \| Maximum
Accounting Policies [Line Items]
Software useful life	5 years
Computer Software, Intangible Asset \| Maximum
Accounting Policies [Line Items]
Software useful life	5 years
Accounting Standards Update 2016-09
Accounting Policies [Line Items]
Deferred tax assets				14,000,000
Accounting Standards Update 2016-01
Accounting Policies [Line Items]
Accumulated earnings	$ 20,064,000		10,467,000
Retained Earnings
Accounting Policies [Line Items]
Cumulative effect of adoption			12,656,000	14,508,000
Retained Earnings \| Accounting Standards Update 2016-09
Accounting Policies [Line Items]
Cumulative effect of adoption				$ 14,000,000
New Revenue Standard \| Accounting Standards Update 2014-09
Accounting Policies [Line Items]
Accumulated earnings	$ 28,389,000		$ (23,123,000)