Combined Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 146,134	$ 97,626	$ 188,733
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Loss on extinguishment of debt	0	150	0
Depreciation and amortization	39,061	28,447	21,515
Unrealized (gain) loss on derivative instruments	(10,182)	14,378	(14,014)
Unrealized (gain) loss on Agency interest-only securities	1,249	(2,144)	2,665
Provision for loan losses	600	600	600
Amortization of equity based compensation	13,788	14,451	2,881
Amortization of deferred financing costs included in interest expense	5,757	5,802	4,600
Amortization of premium on mortgage loan financing	(902)	(629)	(534)
Amortization of above- and below-market lease intangibles	(249)	652	854
Accretion/amortization of discount, premium and other fees on loans	(12,241)	(6,918)	(3,701)
Accretion/amortization of discount, premium and other fees on securities	87,906	91,306	60,321
Realized gain on sale of mortgage loan receivables held for sale	(71,066)	(145,275)	(146,708)
Realized gain on disposition of loan	820	0	0
Realized gain on real estate securities	(24,007)	(26,977)	(4,231)
Realized gain on sale of real estate, net	(40,386)	(29,760)	(13,565)
Realized gain on assignment of mortgage loan financing	0	(432)	0
Origination of mortgage loan receivables held for sale	(2,594,141)	(3,345,372)	(2,013,674)
Repayment of mortgage loan receivables held for sale	2,308	1,293	5,840
Proceeds from sales of mortgage loan receivables held for sale	2,509,090	3,523,689	2,345,705
Accrued interest receivable	621	(9,687)	(2,889)
Earnings on investment in unconsolidated joint ventures	(371)	(1,990)	(3,203)
Distributions from operations of investment in unconsolidated joint ventures	294	1,957	3,894
Deferred tax asset	2,900	(7,175)	0
Changes in operating assets and liabilities:
Other assets	(1,770)	(17,446)	(17,325)
Accrued expenses and other liabilities	(12,985)	22,126	57,318
Net cash provided by (used in) operating activities	40,588	208,672	475,082
Cash flows from investing activities:
Reduction (addition) of cash collateral held by broker for derivatives	16,918	(13,864)	(10,249)
Purchase of derivative instruments	0	(7)	(20)
Purchases of real estate securities	(725,888)	(2,157,391)	(1,193,816)
Repayment of real estate securities	186,902	186,310	390,628
Proceeds from sales of real estate securities	845,648	768,590	194,287
Purchase of FHLB stock	(7,984)	(22,890)	(36,350)
Sale of FHLB stock	2,409	0	0
Origination and purchases of mortgage loan receivables held for investment	(963,023)	(1,201,968)	(486,072)
Repayment of mortgage loan receivables held for investment	752,452	214,511	268,093
Reduction (addition) of cash collateral held by broker	(5,291)	(53)	45,719
Addition (reduction) of deposits received for loan originations	(2,368)	(91)	0
Title deposits included in other assets	5,375	(9,621)	(4,356)
Capital contributions to investment in unconsolidated joint ventures	(31,085)	0	(4,696)
Distributions of return of capital from investment in unconsolidated joint ventures	3,747	3,255	7,417
Capitalization of interest on investment in unconsolidated joint ventures	(341)	0	0
Purchases of real estate	(197,501)	(254,497)	(289,268)
Capital improvements of real estate	(8,375)	(5,192)	(115)
Proceeds from sale of real estate	98,558	123,444	36,930
Net cash provided by (used in) investing activities	(29,847)	(2,369,464)	(1,081,868)
Cash flows from financing activities:
Deferred financing costs paid	(2,330)	(9,863)	(3,191)
Proceeds from borrowings under debt obligations	16,280,023	16,885,636	9,095,845
Repayment of borrowings under debt obligations	(16,137,339)	(14,907,233)	(8,368,016)
Cash dividends paid to Class A common shareholders	(39,934)	0	0
Partners’ capital contributions	0	0	1,800
Partners’ capital distributions	0	(369)	(95,442)
Capital distributed to noncontrolling interests in operating partnership	(68,673)	(47,926)	0
Capital contributed by noncontrolling interests in consolidated joint ventures	74	1,841	9,846
Capital distributed to noncontrolling interests in consolidated joint ventures	(3,930)	(2,207)	(493)
Payment of liability assumed in exchange for shares for the minimum withholding taxes on vesting restricted stock	(4,897)	(125)	0
Purchase of treasury stock	(994)	0	0
Issuance of common stock	0	259,037	0
Common stock offering costs	0	(20,523)	0
Net cash provided by (used in) financing activities	22,000	2,158,268	640,349
Net increase (decrease) in cash	32,741	(2,524)	33,563
Cash and cash equivalents at beginning of period	76,218	78,742	45,179
Cash and cash equivalents at end of period	108,959	76,218	78,742
Supplemental information:
Cash paid for interest, net of amounts capitalized	107,362	63,171	45,317
Cash paid for income taxes	7,306	45,981	5,392
Non-cash investing and financing activities:
Securities sold, not settled	4	3	1,900
Settlement of mortgage loan receivable held for investment by real estate	4,620	0	0
Like-kind exchange of real estate: Acquisitions	15,249	0	0
Like-kind exchange of real estate: Dispositions	(62,093)	0	0
Like-kind exchange of real estate: Receivable from qualified intermediary - other assets	6,483	0	0
Real estate acquired in settlement of mortgage loan receivable held for investment	6,700	0	0
Net settlement of sale of real estate, subject to debt - real estate	(11,310)	0	0
Net settlement of sale of real estate, subject to debt - debt obligations	51,060	0	0
Exchange of capital for common stock	0	468,694	0
Exchange of predecessor LP Units for common stock	0	697,097	0
Exchange of noncontrolling interest for common stock	53,659	0	0
Change in deferred tax asset related to change in tax receivable agreement	(320)	1,014	0
Dividends declared, not paid	$ 17,456	$ 0	$ 0