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Segment and Geographical Information - Long Lived Assets and Continuing Operations by Country (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 487,325	$ 484,781	$ 467,815	$ 459,923	$ 442,942	$ 427,300	$ 413,696	$ 405,164	$ 1,899,843	$ 1,689,102	$ 1,519,084
Income (loss) before income taxes	107,922	$ 111,435	$ 113,765	$ 82,963	108,089	$ 100,200	$ 96,389	$ 74,842	416,084	379,520	337,595
Long-lived assets	35,996				28,099				35,996	28,099	27,465
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									1,607,140	1,419,658	1,281,580
Income (loss) before income taxes									337,914	299,764	269,791
Long-lived assets	30,999				27,443				30,999	27,443	26,685
Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									292,703	269,444	237,504
Income (loss) before income taxes									78,170	79,756	67,804
Long-lived assets	$ 4,997				$ 656				$ 4,997	$ 656	$ 780

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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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