Condensed Consolidating Financial Information Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ (4,936)	$ 7,828
Cash flows from investing activities:
Sale of investment securities	51,218	74,591
Maturities of investment securities	343	947
Purchase of investment securities	(29,112)	(67,628)
Proceeds from sale or liquidation of long-term investments	0	1,216
Purchase of long-term investments	0	(5,000)
Investments in real estate ventures	(5,795)	(7,816)
Distributions from investments in real estate ventures	12	0
Increase in cash surrender value of life insurance policies	(62)	(606)
Increase in restricted assets	(3,017)	(6,933)
Investments in subsidiaries	0	0
Proceeds from sale of fixed assets	0	3
Capital expenditures	(3,915)	(3,156)
Pay downs of investment securities	2,174	1,594
Investments in real estate held for sale	(49)	0
Net cash provided by (used in) investing activities	11,797	(12,788)
Cash flows from financing activities:
Proceeds from issuance of debt	57	0
Deferred financing costs	0	(585)
Repayments of debt	(1,576)	(1,857)
Borrowings under revolver	59,426	107,668
Repayments on revolver	(41,482)	(110,792)
Capital contributions received	0	0
Intercompany dividends paid	0	0
Dividends and distributions on common stock	(48,876)	(46,350)
Contributions from non-controlling interest	248	0
Distributions to non-controlling interest	(5,978)	0
Proceeds from exercise of Vector options	0	809
Tax benefit of options exercised	0	274
Net cash used in financing activities	(38,181)	(50,833)
Net decrease in cash and cash equivalents	(31,320)	(55,793)
Cash and cash equivalents, beginning of period	240,368	326,365
Cash and cash equivalents, end of period	209,048	270,572
Parent/Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	12,633	(1,451)
Cash flows from investing activities:
Sale of investment securities	46,497	60,176
Maturities of investment securities	343	947
Purchase of investment securities	(29,112)	(66,152)
Proceeds from sale or liquidation of long-term investments		1,106
Purchase of long-term investments		(5,000)
Investments in real estate ventures	0	0
Distributions from investments in real estate ventures	0
Increase in cash surrender value of life insurance policies	0	(558)
Increase in restricted assets	(3)	(1)
Investments in subsidiaries	(471)	(1,969)
Proceeds from sale of fixed assets		0
Capital expenditures	(18)	0
Pay downs of investment securities	2,174	1,594
Investments in real estate held for sale	0
Net cash provided by (used in) investing activities	19,410	(9,857)
Cash flows from financing activities:
Proceeds from issuance of debt	0
Deferred financing costs		0
Repayments of debt	0	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	(48,876)	(46,350)
Contributions from non-controlling interest	0
Distributions to non-controlling interest	0
Proceeds from exercise of Vector options		809
Tax benefit of options exercised		274
Net cash used in financing activities	(48,876)	(45,267)
Net decrease in cash and cash equivalents	(16,833)	(56,575)
Cash and cash equivalents, beginning of period	111,470	211,751
Cash and cash equivalents, end of period	94,637	155,176
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	30,671	58,885
Cash flows from investing activities:
Sale of investment securities	4,721	14,415
Maturities of investment securities	0	0
Purchase of investment securities	0	(1,476)
Proceeds from sale or liquidation of long-term investments		0
Purchase of long-term investments		0
Investments in real estate ventures	0	0
Distributions from investments in real estate ventures	0
Increase in cash surrender value of life insurance policies	(62)	(48)
Increase in restricted assets	(3,014)	(6,932)
Investments in subsidiaries	0	0
Proceeds from sale of fixed assets		3
Capital expenditures	(2,618)	(956)
Pay downs of investment securities	0	0
Investments in real estate held for sale	0
Net cash provided by (used in) investing activities	(973)	5,006
Cash flows from financing activities:
Proceeds from issuance of debt	0
Deferred financing costs		(585)
Repayments of debt	(1,545)	(1,797)
Borrowings under revolver	59,426	107,668
Repayments on revolver	(41,482)	(110,792)
Capital contributions received	100	1,950
Intercompany dividends paid	(34,908)	(43,955)
Dividends and distributions on common stock	0	0
Contributions from non-controlling interest	0
Distributions to non-controlling interest	0
Proceeds from exercise of Vector options		0
Tax benefit of options exercised		0
Net cash used in financing activities	(18,409)	(47,511)
Net decrease in cash and cash equivalents	11,289	16,380
Cash and cash equivalents, beginning of period	12,375	9,724
Cash and cash equivalents, end of period	23,664	26,104
Subsidiary Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	1,917	(4,122)
Cash flows from investing activities:
Sale of investment securities	0	0
Maturities of investment securities	0	0
Purchase of investment securities	0	0
Proceeds from sale or liquidation of long-term investments		110
Purchase of long-term investments		0
Investments in real estate ventures	(5,795)	(7,816)
Distributions from investments in real estate ventures	12
Increase in cash surrender value of life insurance policies	0	0
Increase in restricted assets	0	0
Investments in subsidiaries	0	0
Proceeds from sale of fixed assets		0
Capital expenditures	(1,279)	(2,200)
Pay downs of investment securities	0	0
Investments in real estate held for sale	(49)
Net cash provided by (used in) investing activities	(7,111)	(9,906)
Cash flows from financing activities:
Proceeds from issuance of debt	57
Deferred financing costs		0
Repayments of debt	(31)	(60)
Borrowings under revolver	0	0
Repayments on revolver	0	0
Capital contributions received	371	19
Intercompany dividends paid	(15,249)	(1,529)
Dividends and distributions on common stock	0	0
Contributions from non-controlling interest	248
Distributions to non-controlling interest	(5,978)
Proceeds from exercise of Vector options		0
Tax benefit of options exercised		0
Net cash used in financing activities	(20,582)	(1,570)
Net decrease in cash and cash equivalents	(25,776)	(15,598)
Cash and cash equivalents, beginning of period	116,523	104,890
Cash and cash equivalents, end of period	90,747	89,292
Consolidating Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(50,157)	(45,484)
Cash flows from investing activities:
Sale of investment securities	0	0
Maturities of investment securities	0	0
Purchase of investment securities	0	0
Proceeds from sale or liquidation of long-term investments		0
Purchase of long-term investments		0
Investments in real estate ventures	0	0
Distributions from investments in real estate ventures	0
Increase in cash surrender value of life insurance policies	0	0
Increase in restricted assets	0	0
Investments in subsidiaries	471	1,969
Proceeds from sale of fixed assets		0
Capital expenditures	0	0
Pay downs of investment securities	0	0
Investments in real estate held for sale	0
Net cash provided by (used in) investing activities	471	1,969
Cash flows from financing activities:
Proceeds from issuance of debt	0
Deferred financing costs		0
Repayments of debt	0	0
Borrowings under revolver	0	0
Repayments on revolver	0	0
Capital contributions received	(471)	(1,969)
Intercompany dividends paid	50,157	45,484
Dividends and distributions on common stock	0	0
Contributions from non-controlling interest	0
Distributions to non-controlling interest	0
Proceeds from exercise of Vector options		0
Tax benefit of options exercised		0
Net cash used in financing activities	49,686	43,515
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