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Segment and Geographical Information - Long Lived Assets and Continuing Operations by Country (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 467,815	$ 413,696	$ 927,737	$ 818,860
Income (loss) before income taxes	113,765	96,389	196,727	171,230
Long-lived assets	26,668		26,668		$ 28,099
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	395,710	349,388	779,504	689,182
Income (loss) before income taxes	94,100	77,511	157,314	135,543
Long-lived assets	26,122		26,122		27,443
Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	72,105	64,308	148,233	129,678
Income (loss) before income taxes	19,665	$ 18,878	39,413	$ 35,687
Long-lived assets	$ 546		$ 546		$ 656

X

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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