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Deferred Policy Acquisition Costs - Balance RollForward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Policy Acquisition Costs Disclosures [Abstract]      
DAC balance, beginning of period $ 1,951,892 $ 1,713,065 $ 1,500,259
Capitalization 441,874 433,575 387,396
Amortization (239,730) (209,399) (180,582)
Foreign exchange translation and other (20,116) 14,651 5,992
DAC balance, end of period $ 2,133,920 $ 1,951,892 $ 1,713,065