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Concentration of Credit Risk - Schedule of Geographical Concentration of Credit Risk (Details) - Geographic Concentration Risk	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
California | Percentage of Total Company Assets
Concentration Risk [Line Items]
Concentration risk (as a percent)	34.00%	31.00%
California | Percentage of Total Company Revenues
Concentration Risk [Line Items]
Concentration risk (as a percent)	26.00%	26.00%	26.00%
Texas | Percentage of Total Company Assets
Concentration Risk [Line Items]
Concentration risk (as a percent)	16.00%	14.00%
Texas | Percentage of Total Company Revenues
Concentration Risk [Line Items]
Concentration risk (as a percent)	18.00%	17.00%	17.00%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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