Investments - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 0
Fair Value of Limited Partnership Interest	5,433
Kayne Senior Credit Fund II, L.P.
Investment Holdings [Line Items]
Fair Value of Limited Partnership Interest	1,450
United Capital Funding Corp.
Investment Holdings [Line Items]
Payments to Acquire Other Investments	1,000
Other Long-term Investments
Investment Holdings [Line Items]
Other Long-term Investments	$ 5,733	$ 5,210

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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