Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Full House Mortgage Connection, Inc. - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 12, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability			$ 6,300
Percentage of gross revenues to be paid yearly	8.00%
Measured on a recurring basis | Contingent consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	$ 6,580	$ 6,400
Level 3 | Measured on a recurring basis | Contingent consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	$ 6,580	$ 6,400