Loans - Activity in Portfolio (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Activity in allowance for loan losses
Allowance for loan losses at the beginning of the period			$ 6,029	$ 6,031
Provision for loan losses			1,268	2,978
Allowance for loan losses at the end of the period	$ 7,297	$ 9,009	7,297	9,009
Recorded investment in loans related to the allowance for loan loss	341,343	493,274	341,343	493,274
Activity in loan portfolio
Balance at the beginning of the period			6,263,517	6,300,285
Acquisitions/origination/additional funding			1,492,845	2,150,080
Capitalized Interest			44,875	33,509
Basis of loans sold			(596,454)	(1,411,912)
Loan maturities/principal repayments			(1,199,205)	(695,750)
Discount accretion/premium amortization			23,362	18,139
Changes in fair value	13,235	10,831	20,126	31,962
Unrealized foreign currency remeasurement loss			(33,325)	(4,419)
Change in loan loss allowance, net			(1,268)	(2,978)
Transfer to/from other asset classifications			9,353	(172)
Balance at the end of the period	$ 6,023,826	$ 6,418,744	$ 6,023,826	$ 6,418,744