Other Investments (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Schedule of Cost-method Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 399,890,000	$ 375,090,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	10,292,000	8,230,000
Other Long-term Investments	4,603,000us-gaap_OtherLongTermInvestments	3,010,000us-gaap_OtherLongTermInvestments
DCR Mortgage Fund VI, L.P. [Member]
Schedule of Cost-method Investments [Line Items]
Payments to Acquire Limited Partnership Interests	750,000
Available-for-sale Securities, Amortized Cost Basis	760,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	208,000
Fair Value of Limited Partnership Interest	968,000
RCH Mortgage Fund VI, L.P. [Member]
Schedule of Cost-method Investments [Line Items]
Payments to Acquire Limited Partnership Interests	1,000,000
Available-for-sale Securities, Amortized Cost Basis	956,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	80,000
Fair Value of Limited Partnership Interest	1,036,000
Kayne Senior Credit Fund II, L.P. [Member]
Schedule of Cost-method Investments [Line Items]
Payments to Acquire Limited Partnership Interests	739,000
Available-for-sale Securities, Amortized Cost Basis	739,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0
Fair Value of Limited Partnership Interest	739,000
Limited Partner [Member]
Schedule of Cost-method Investments [Line Items]
Payments to Acquire Limited Partnership Interests	2,489,000
Available-for-sale Securities, Amortized Cost Basis	2,455,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	288,000
Fair Value of Limited Partnership Interest	2,743,000
Certificates of Deposit [Member]
Schedule of Cost-method Investments [Line Items]
Payments to Acquire Restricted Certificates of Deposit	1,860,000
Available-for-sale Securities, Amortized Cost Basis	1,860,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0
Certificates of Deposit, at Carrying Value	1,860,000
Other Long-term Investments [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments	4,349,000
Available-for-sale Securities, Amortized Cost Basis	4,315,000	2,749,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	288,000	261,000
Other Long-term Investments	$ 4,603,000	$ 3,010,000

Fair Value of Limited Partnership Interest

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

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-Topic 210

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-Subparagraph (SX 210.5-02.1)

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- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

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-SubTopic 10

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Other long-term investments not otherwise specified in the taxonomy, not including investments in marketable securities.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.5-02.12)

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-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(f))

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Cash outflow related to the acquisition or continued holding of limited partnership interests held for investment purposes.

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- Definition

The cash outflow from temporary investment with specific maturity and interest rate that are prohibited for current use.

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-Name Accounting Standards Codification

-Glossary Investing Activities

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