Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement of Cash Flows [Abstract]
Net cash provided by operating activities	$ 78,825	$ 83,885
Cash flows from investing activities:
Sale of investment securities	67,033	118,261
Maturities of investment securities	343	1,737
Purchase of investment securities	(56,691)	(113,595)
Proceeds from sale or liquidation of long-term investments	1,000	1,254
Purchase of long-term investments	(50)	(5,000)
Investments in real estate ventures	(11,806)	(34,857)
Distributions from investments in real estate ventures	17,983	0
Increase in cash surrender value of life insurance policies	(393)	(1,118)
Decrease (increase) in restricted assets	2,674	(7,934)
Issuance of notes receivable	0	(4,410)
Proceeds from sale of fixed assets	5	3
Capital expenditures	(7,615)	(5,379)
Pay downs of investment securities	4,926	3,530
Proceeds from sale of preferred securities	0	1,000
Investments in real estate, net	(81)	(12,502)
Net cash provided by (used in) investing activities	17,328	(59,010)
Cash flows from financing activities:
Proceeds from issuance of debt	243,282	22
Deferred financing costs	(6,600)	(625)
Repayments of debt	(2,917)	(3,374)
Borrowings under revolver	89,695	126,727
Repayments on revolver	(80,223)	(144,492)
Dividends and distributions on common stock	(97,846)	(92,778)
Contributions from non-controlling interest	248	0
Distributions to non-controlling interest	(7,422)	0
Proceeds from exercise of Vector options	0	1,219
Tax benefit of options exercised	0	384
Net cash provided by (used in) financing activities	138,217	(112,917)
Net increase (decrease) in cash and cash equivalents	234,370	(88,042)
Cash and cash equivalents, beginning of period	240,368	326,365
Cash and cash equivalents, end of period	$ 474,738	$ 238,323