Condensed Consolidating Financial Information Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 5,190	$ 57,829
Cash flows from investing activities:
Sale of investment securities	43,115	0
Purchase of investment securities	(90,368)	(1,148)
Proceeds from sale or liquidation of long-term investments	75	72
Purchase of long-term investments	(5,000)	(5,000)
Investments in non-consolidated real estate businesses	(19,048)	(9,667)
Investments in consolidated real estate businesses	(7,657)	0
Distributions from non-consolidated real estate businesses	0	6,221
Increase in cash surrender value of life insurance policies	(303)	(620)
Increase in restricted assets	(1,268)	(53)
Issuance of notes receivable	0	(234)
Proceeds from sale of fixed assets	13	404
Investments in subsidiaries	0	0
Capital expenditures	(5,995)	(7,394)
Repayments of notes receivable	8,433	0
Net cash used in investing activities	(78,003)	(17,419)
Cash flows from financing activities:
Proceeds from debt issuance	453,080	14,018
Deferred financing costs	(11,663)	(315)
Repayments of debt	(418,833)	(13,493)
Borrowings under revolver	474,493	525,350
Repayments on revolver	(476,888)	(532,082)
Capital contributions received	0	0
Intercompany dividends paid	0	0
Dividends and distributions on common stock	(71,518)	(66,112)
Proceeds from exercise of Vector options	0	45
Tax benefits from exercise of Vector options	0	4
Net cash used in financing activities	(51,329)	(72,585)
Net decrease in cash and cash equivalents	(124,142)	(32,175)
Cash and cash equivalents, beginning of period	405,855	240,923
Cash and cash equivalents, end of period	281,713	208,748
Parent/Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	5,204	22,900
Cash flows from investing activities:
Sale of investment securities	36,533
Purchase of investment securities	(79,368)	0
Proceeds from sale or liquidation of long-term investments	0	0
Purchase of long-term investments	(5,000)	(5,000)
Investments in non-consolidated real estate businesses	0	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	79	(425)
Increase in restricted assets	6	268
Issuance of notes receivable		(234)
Proceeds from sale of fixed assets	0	393
Investments in subsidiaries	(43,584)	(1,008)
Capital expenditures	(2,247)	(961)
Repayments of notes receivable	8,433
Net cash used in investing activities	(85,148)	(6,967)
Cash flows from financing activities:
Proceeds from debt issuance	450,000	0
Deferred financing costs	(11,663)	0
Repayments of debt	(415,000)	0
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	(71,518)	(66,112)
Proceeds from exercise of Vector options		45
Tax benefits from exercise of Vector options		4
Net cash used in financing activities	(48,181)	(66,063)
Net decrease in cash and cash equivalents	(128,125)	(50,130)
Cash and cash equivalents, beginning of period	401,344	238,262
Cash and cash equivalents, end of period	273,219	188,132
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	57,823	74,473
Cash flows from investing activities:
Sale of investment securities	6,582
Purchase of investment securities	(11,000)	(1,148)
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
Investments in consolidated real estate businesses	0
Distributions from non-consolidated real estate businesses		0
Increase in cash surrender value of life insurance policies	(382)	(195)
Increase in restricted assets	(1,274)	(321)
Issuance of notes receivable		0
Proceeds from sale of fixed assets	13	11
Investments in subsidiaries	0	0
Capital expenditures	(3,319)	(6,334)
Repayments of notes receivable	0
Net cash used in investing activities	(9,380)	(7,987)
Cash flows from financing activities:
Proceeds from debt issuance	0	14,018
Deferred financing costs	0	(315)
Repayments of debt	(3,763)	(13,428)
Borrowings under revolver	474,493	525,350
Repayments on revolver	(476,888)	(532,082)
Capital contributions received	12,300	950
Intercompany dividends paid	(50,582)	(43,500)
Dividends and distributions on common stock	0	0
Proceeds from exercise of Vector options		0
Tax benefits from exercise of Vector options		0
Net cash used in financing activities	(44,440)	(49,007)
Net decrease in cash and cash equivalents	4,003	17,479
Cash and cash equivalents, beginning of period	3,776	2,488
Cash and cash equivalents, end of period	7,779	19,967
Subsidiary Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	2,187	5,557
Cash flows from investing activities:
Sale of investment securities	0
Purchase of investment securities	0	0
Proceeds from sale or liquidation of long-term investments	75	72
Purchase of long-term investments	0	0
Investments in non-consolidated real estate businesses	(19,048)	(9,667)
Investments in consolidated real estate businesses	(7,657)
Distributions from non-consolidated real estate businesses		6,221
Increase in cash surrender value of life insurance policies	0	0
Increase in restricted assets	0	0
Issuance of notes receivable		0
Proceeds from sale of fixed assets	0	0
Investments in subsidiaries	0	0
Capital expenditures	(429)	(99)
Repayments of notes receivable	0
Net cash used in investing activities	(27,059)	(3,473)
Cash flows from financing activities:
Proceeds from debt issuance	3,080	0
Deferred financing costs	0	0
Repayments of debt	(70)	(65)
Borrowings under revolver	0	0
Repayments on revolver	0	0
Capital contributions received	31,284	58
Intercompany dividends paid	(9,442)	(1,601)
Dividends and distributions on common stock	0	0
Proceeds from exercise of Vector options		0
Tax benefits from exercise of Vector options		0
Net cash used in financing activities	24,852	(1,608)
Net decrease in cash and cash equivalents	(20)	476
Cash and cash equivalents, beginning of period	735	173
Cash and cash equivalents, end of period	715	649
Consolidating Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(60,024)	(45,101)
Cash flows from investing activities:
Sale of investment securities	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
Investments in consolidated real estate businesses
Distributions from non-consolidated real estate businesses		0
Increase in cash surrender value of life insurance policies		0
Increase in restricted assets		0
Issuance of notes receivable		0
Proceeds from sale of fixed assets		0
Investments in subsidiaries	43,584	1,008
Capital expenditures		0
Net cash used in investing activities	43,584	1,008
Cash flows from financing activities:
Proceeds from debt issuance		0
Deferred financing costs		0
Repayments of debt		0
Borrowings under revolver		0
Repayments on revolver		0
Capital contributions received	(43,584)	(1,008)
Intercompany dividends paid	60,024	45,101
Dividends and distributions on common stock		0
Proceeds from exercise of Vector options		0
Tax benefits from exercise of Vector options		0
Net cash used in financing activities	16,440	44,093
Net 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