Derivative Instruments - Derivatives Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Interest Rate Contract
Carrying amount of the hedged liability - Subordinated bank note - 2025	$ 153,307		$ 153,307		$ 144,296
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged liability - Subordinated bank note - 2025	4,682		4,682		$ (4,165)
Gains and losses related to changes in the fair vale of the interest rate swap and hedged debt
Interest expense on borrowings	17,115	$ 10,726	48,050	$ 31,850
Summary of Net Investment Hedge Activity [Abstract]
Effect of net investment hedges on accumulated other comprehensive income	2,170	2,537	(3,761)	4,637
Derivatives designated as hedges | Interest expense - borrowings
Gains and losses related to changes in the fair vale of the interest rate swap and hedged debt
Gain (loss) of fair value hedge: Hedged item	(2,100)	1,206	(8,847)	6,337
Gain (loss) of fair value hedge: Derivative designated as a hedging instrument	(2,195)	1,165	(8,938)	6,621
Net income (expense) recognized on fair value hedge in interest expense on borrowings	95	41	91	(284)
Derivatives designated as hedges | Net investment hedges | Forward foreign exchange contracts
Summary of Net Investment Hedge Activity [Abstract]
Effect of net investment hedges on accumulated other comprehensive income	$ 2,170	$ (2,537)	$ (3,761)	$ 4,637