Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Service agreement, cost of services	$ 15,000
Other income, net		$ 14,735	$ 6,242	$ 5,251
Cole Capital [Member] | Held-for-sale or Disposed of by Sale [Member]
Deferred Revenue Arrangement [Line Items]
Contingent consideration, payment period		6 years
Contingent consideration, maximum consideration receivable	80,000	$ 80,000
Service Agreement [Member]
Deferred Revenue Arrangement [Line Items]
Other income, net	$ 15,000