Investments - Narrative (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Investment Holdings [Line Items]
Other Long-term Investments	$ 3,010,000us-gaap_OtherLongTermInvestments	$ 3,034,000us-gaap_OtherLongTermInvestments
Available-for-sale Securities, Fair Value Disclosure	381,627,000us-gaap_AvailableForSaleSecurities	291,660,000us-gaap_AvailableForSaleSecurities
Fair Value of Limited Partnership Interest	2,710,000
Other than Temporary Impairment Losses, Investments	0us-gaap_ImpairmentOfInvestments
Kayne Senior Credit Fund II, L.P. [Member]
Investment Holdings [Line Items]
Fair Value of Limited Partnership Interest	739,000
Payments to Acquire Other Investments	1,261,000
United Capital Funding Corp. [Member]
Investment Holdings [Line Items]
Payments to Acquire Other Investments		1,000,000
Fair Value, Inputs, Level 3 [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Fair Value Disclosure	1,971,000	0
Other Long-term Investments [Member]
Investment Holdings [Line Items]
Other Long-term Investments	3,010,000	3,034,000
Available-for-sale Securities, Fair Value Disclosure	3,010,000	3,034,000
Other Long-term Investments [Member] \| Fair Value, Inputs, Level 3 [Member]
Investment Holdings [Line Items]
Available-for-sale Securities, Fair Value Disclosure	$ 1,971,000	$ 0

Fair Value of Limited Partnership Interest

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

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- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

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

-Publisher FASB

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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- Definition

The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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