Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Cash Flows [Abstract]
Net cash provided by (used in) operating activities	$ 27,896	$ (4,936)
Cash flows from investing activities:
Sale of investment securities	13,456	51,218
Maturities of investment securities	7,174	343
Purchase of investment securities	(14,974)	(29,112)
Purchase of long-term investments	(22,400)	0
Investments in real estate ventures	(1,436)	(5,795)
Distributions from investments in real estate ventures	0	12
Increase in cash surrender value of life insurance policies	(49)	(62)
Decrease (increase) in restricted assets	1,156	(3,017)
Issuance of notes receivable	(1,500)	0
Proceeds from sale of fixed assets	2	0
Capital expenditures	(4,588)	(3,915)
Pay downs of investment securities	864	2,174
Investments in real estate, net	(70)	(49)
Net cash (used in) provided by investing activities	(22,365)	11,797
Cash flows from financing activities:
Proceeds from issuance of debt	850,000	57
Deferred financing costs	(19,200)	0
Repayments of debt	(835,697)	(1,576)
Borrowings under revolver	39,956	59,426
Repayments on revolver	(68,305)	(41,482)
Dividends and distributions on common stock	(52,358)	(48,876)
Contributions from non-controlling interest	0	248
Distributions to non-controlling interest	0	(5,978)
Proceeds from issuance of Vector stock	43,230	0
Net cash used in financing activities	(42,374)	(38,181)
Net decrease in cash and cash equivalents	(36,843)	(31,320)
Cash and cash equivalents, beginning of period	393,530	240,368
Cash and cash equivalents, end of period	$ 356,687	$ 209,048