Condensed Consolidating Financial Information Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 53,995	$ 5,190
Cash flows from investing activities:
Sale of investment securities	49,296	43,115
Purchase of investment securities	(110,419)	(90,368)
Proceeds from sale or liquidation of long-term investments	549	75
Purchase of long-term investments	(7,000)	(5,000)
Investments in non-consolidated real estate businesses	(12,534)	(19,048)
Purchase of subsidiaries	250
Investments in consolidated real estate businesses	0	(7,657)
Distributions from non-consolidated real estate businesses	3,539	0
Increase in cash surrender value of life insurance policies	(395)	(303)
Decrease (increase) in restricted assets	(371)	(1,268)
Repayments of notes receivable	933	8,433
Issuance of notes receivable	(250)	0
Investments in subsidiaries	0	0
Proceeds from sale of fixed assets	4	13
Capital expenditures	(10,144)	(5,995)
Net cash used in investing activities	(87,042)	(78,003)
Cash flows from financing activities:
Proceeds from debt issuance	413,916	453,080
Deferred financing costs	(12,360)	(11,663)
Repayments of debt	(8,051)	(418,833)
Borrowings under revolver	429,188	474,493
Repayments on revolver	(437,736)	(476,888)
Capital contributions received	0	0
Intercompany dividends paid	0	0
Dividends and distributions on common stock	(80,963)	(71,518)
Distributions to non-controlling interest	(3,075)
Proceeds from exercise of Vector options	3,405	0
Tax benefit of options exercised	680	0
Net cash provided by (used in) financing activities	305,004	(51,329)
Net increase (decrease) in cash and cash equivalents	271,957	(124,142)
Cash and cash equivalents, beginning of period	234,466	405,855
Cash and cash equivalents, end of period	506,423	281,713
Parent/Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	17,374	5,204
Cash flows from investing activities:
Sale of investment securities	49,296	36,533
Purchase of investment securities	(108,859)	(79,368)
Proceeds from sale or liquidation of long-term investments	500	0
Purchase of long-term investments	(7,000)	(5,000)
Investments in non-consolidated real estate businesses	0	0
Purchase of subsidiaries	0
Investments in consolidated real estate businesses		0
Distributions from non-consolidated real estate businesses	0
Increase in cash surrender value of life insurance policies	0	79
Decrease (increase) in restricted assets	299	6
Repayments of notes receivable	35,933	8,433
Issuance of notes receivable	(35,000)
Investments in subsidiaries	(25,267)	(43,584)
Proceeds from sale of fixed assets	0	0
Capital expenditures	(11)	(2,247)
Net cash used in investing activities	(90,109)	(85,148)
Cash flows from financing activities:
Proceeds from debt issuance	408,750	450,000
Deferred financing costs	(12,360)	(11,663)
Repayments of debt	0	(415,000)
Borrowings under revolver	0	0
Repayments on revolver	0	0
Capital contributions received	0	0
Intercompany dividends paid	0	0
Dividends and distributions on common stock	(80,963)	(71,518)
Distributions to non-controlling interest	0
Proceeds from exercise of Vector options	3,405
Tax benefit of options exercised	680
Net cash provided by (used in) financing activities	319,512	(48,181)
Net increase (decrease) in cash and cash equivalents	246,777	(128,125)
Cash and cash equivalents, beginning of period	151,342	401,344
Cash and cash equivalents, end of period	398,119	273,219
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	46,294	57,823
Cash flows from investing activities:
Sale of investment securities	0	6,582
Purchase of investment securities	(1,560)	(11,000)
Proceeds from sale or liquidation of long-term investments	0	0
Purchase of long-term investments	0	0
Investments in non-consolidated real estate businesses	0	0
Purchase of subsidiaries	0
Investments in consolidated real estate businesses		0
Distributions from non-consolidated real estate businesses	0
Increase in cash surrender value of life insurance policies	(395)	(382)
Decrease (increase) in restricted assets	19	(1,274)
Repayments of notes receivable	0	0
Issuance of notes receivable	0
Investments in subsidiaries	0	0
Proceeds from sale of fixed assets	4	13
Capital expenditures	(6,563)	(3,319)
Net cash used in investing activities	(8,495)	(9,380)
Cash flows from financing activities:
Proceeds from debt issuance	40,166	0
Deferred financing costs	0	0
Repayments of debt	(39,293)	(3,763)
Borrowings under revolver	429,188	474,493
Repayments on revolver	(437,736)	(476,888)
Capital contributions received	3,150	12,300
Intercompany dividends paid	(30,000)	(50,582)
Dividends and distributions on common stock	0	0
Distributions to non-controlling interest	0
Proceeds from exercise of Vector options	0
Tax benefit of options exercised	0
Net cash provided by (used in) financing activities	(34,525)	(44,440)
Net increase (decrease) in cash and cash equivalents	3,274	4,003
Cash and cash equivalents, beginning of period	11,812	3,776
Cash and cash equivalents, end of period	15,086	7,779
Subsidiary Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	32,279	2,187
Cash flows from investing activities:
Sale of investment securities	0	0
Purchase of investment securities	0	0
Proceeds from sale or liquidation of long-term investments	49	75
Purchase of long-term investments	0	0
Investments in non-consolidated real estate businesses	(12,534)	(19,048)
Purchase of subsidiaries	250
Investments in consolidated real estate businesses		(7,657)
Distributions from non-consolidated real estate businesses	3,539
Increase in cash surrender value of life insurance policies	0	0
Decrease (increase) in restricted assets	(689)	0
Repayments of notes receivable	0	0
Issuance of notes receivable	(250)
Investments in subsidiaries	0	0
Proceeds from sale of fixed assets	0	0
Capital expenditures	(3,570)	(429)
Net cash used in investing activities	(13,705)	(27,059)
Cash flows from financing activities:
Proceeds from debt issuance	0	3,080
Deferred financing costs	0	0
Repayments of debt	(3,758)	(70)
Borrowings under revolver	0	0
Repayments on revolver	0	0
Capital contributions received	22,117	31,284
Intercompany dividends paid	(11,952)	(9,442)
Dividends and distributions on common stock	0	0
Distributions to non-controlling interest	(3,075)
Proceeds from exercise of Vector options	0
Tax benefit of options exercised	0
Net cash provided by (used in) financing activities	3,332	24,852
Net increase (decrease) in cash and cash equivalents	21,906	(20)
Cash and cash equivalents, beginning of period	71,312	735
Cash and cash equivalents, end of period	93,218	715
Consolidating Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(41,952)	(60,024)
Cash flows from investing activities:
Sale of investment securities	0	0
Purchase of investment securities	0	0
Proceeds from sale or liquidation of long-term investments	0	0
Purchase of long-term investments	0	0
Investments in non-consolidated real estate businesses	0	0
Purchase of subsidiaries	0
Investments in consolidated real estate businesses		0
Distributions from non-consolidated real estate businesses	0
Increase in cash surrender value of life insurance policies	0	0
Decrease (increase) in restricted assets	0	0
Repayments of notes receivable	(35,000)	0
Issuance of notes receivable	35,000
Investments in subsidiaries	25,267	43,584
Proceeds from sale of fixed assets	0	0
Capital expenditures	0	0
Net cash used in investing activities	25,267	43,584
Cash flows from financing activities:
Proceeds from debt issuance	(35,000)	0
Deferred financing costs	0	0
Repayments of debt	35,000	0
Borrowings under revolver	0	0
Repayments on revolver	0	0
Capital contributions received	(25,267)	(43,584)
Intercompany dividends paid	41,952	60,024
Dividends and distributions on common stock	0	0
Distributions to non-controlling interest	0
Proceeds from exercise of Vector options	0
Tax benefit of options exercised	0
Net cash provided by (used in) financing activities	16,685	16,440
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	$ 0	$ 0