Condensed Consolidating Financial Information Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 55,244	$ 97,245
Cash flows from investing activities:
Sale of investment securities	82,649	3,831
Purchase of investment securities	(129,483)	(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	(45,977)	(22,467)
Investments in consolidated real estate businesses	(7,697)	0
Distributions from non-consolidated real estate businesses	2,463	31,221
Increase in cash surrender value of life insurance policies	(470)	(831)
Increase in restricted assets	(553)	(1,126)
Issuance of notes receivable	0	(355)
Proceeds from sale of fixed assets	11	418
Investments in subsidiaries	0	0
Capital expenditures	(8,686)	(8,268)
Repayments of notes receivable	9,460	0
Net cash used in investing activities	(103,208)	(3,653)
Cash flows from financing activities:
Proceeds from debt issuance	454,200	14,018
Deferred financing costs	(11,750)	(315)
Repayments of debt	(420,710)	(15,440)
Borrowings under revolver	723,578	794,249
Repayments on revolver	(736,007)	(809,567)
Capital contributions received	0	0
Intercompany dividends paid	0	0
Dividends and distributions on common stock	(107,302)	(100,392)
Proceeds from exercise of Vector options	528	140
Tax benefits from exercise of Vector options	33	48
Net cash used in financing activities	(97,430)	(117,259)
Net decrease in cash and cash equivalents	(145,394)	(23,667)
Cash and cash equivalents, beginning of period	405,855	240,923
Cash and cash equivalents, end of period	260,461	217,256
Parent/Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	44,750	81,661
Cash flows from investing activities:
Sale of investment securities	76,067	0
Purchase of investment securities	(117,982)	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	0
Increase in cash surrender value of life insurance policies	(20)	(425)
Increase in restricted assets	5	266
Issuance of notes receivable		(355)
Proceeds from sale of fixed assets	0	406
Investments in subsidiaries	(72,962)	(14,351)
Capital expenditures	(2,320)	(961)
Repayments of notes receivable	9,460
Net cash used in investing activities	(112,752)	(20,420)
Cash flows from financing activities:
Proceeds from debt issuance	450,000	0
Deferred financing costs	(11,750)	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	(107,302)	(100,392)
Proceeds from exercise of Vector options	528	140
Tax benefits from exercise of Vector options	33	48
Net cash used in financing activities	(83,491)	(100,204)
Net decrease in cash and cash equivalents	(151,493)	(38,963)
Cash and cash equivalents, beginning of period	401,344	238,262
Cash and cash equivalents, end of period	249,851	199,299
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	127,382	145,446
Cash flows from investing activities:
Sale of investment securities	6,582	3,831
Purchase of investment securities	(11,501)	(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	0
Increase in cash surrender value of life insurance policies	(450)	(406)
Increase in restricted assets	(558)	(1,392)
Issuance of notes receivable		0
Proceeds from sale of fixed assets	11	12
Investments in subsidiaries	0	0
Capital expenditures	(5,813)	(7,151)
Repayments of notes receivable	0
Net cash used in investing activities	(11,729)	(6,254)
Cash flows from financing activities:
Proceeds from debt issuance	1,120	14,018
Deferred financing costs	0	(315)
Repayments of debt	(5,604)	(15,341)
Borrowings under revolver	723,578	794,249
Repayments on revolver	(736,007)	(809,567)
Capital contributions received	13,250	1,450
Intercompany dividends paid	(105,882)	(108,500)
Dividends and distributions on common stock	0	0
Proceeds from exercise of Vector options	0	0
Tax benefits from exercise of Vector options	0	0
Net cash used in financing activities	(109,545)	(124,006)
Net decrease in cash and cash equivalents	6,108	15,186
Cash and cash equivalents, beginning of period	3,776	2,488
Cash and cash equivalents, end of period	9,884	17,674
Subsidiary Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	1,524	11,423
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	75	72
Purchase of long-term investments	0	0
Investments in non-consolidated real estate businesses	(45,977)	(22,467)
Investments in consolidated real estate businesses	(7,697)
Distributions from non-consolidated real estate businesses	2,463	31,221
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	(553)	(156)
Repayments of notes receivable	0
Net cash used in investing activities	(51,689)	8,670
Cash flows from financing activities:
Proceeds from debt issuance	3,080	0
Deferred financing costs	0	0
Repayments of debt	(106)	(99)
Borrowings under revolver	0	0
Repayments on revolver	0	0
Capital contributions received	59,712	12,901
Intercompany dividends paid	(12,530)	(32,785)
Dividends and distributions on common stock	0	0
Proceeds from exercise of Vector options	0	0
Tax benefits from exercise of Vector options	0	0
Net cash used in financing activities	50,156	(19,983)
Net decrease in cash and cash equivalents	(9)	110
Cash and cash equivalents, beginning of period	735	173
Cash and cash equivalents, end of period	726	283
Consolidating Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(118,412)	(141,285)
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
Investments in consolidated real estate businesses	0
Distributions from non-consolidated real estate businesses	0	0
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	72,962	14,351
Capital expenditures	0	0
Net cash used in investing activities	72,962	14,351
Cash flows from financing activities:
Proceeds from debt issuance	0	0
Deferred financing costs	0	0
Repayments of debt	0	0
Borrowings under revolver	0	0
Repayments on revolver	0	0
Capital contributions received	(72,962)	(14,351)
Intercompany dividends paid	118,412	141,285
Dividends and distributions on common stock	0	0
Proceeds from exercise of Vector options	0	0
Tax benefits from exercise of Vector options	0	0
Net cash used in financing activities	45,450	126,934
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