Investments - Schedule of Investments in Limited Partnerships (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Schedule of Cost-Method Investments
Other investments, cost	$ 441,235	$ 375,090
Unrealized gain	7,442	8,230
Other Long-Term Investments
Schedule of Cost-Method Investments
Total other investments	2,758
Other investments, cost	2,734	2,749
Unrealized gain	302	261
Other long-term investments	3,036	$ 3,010
Limited Partnership
Schedule of Cost-Method Investments
Initial investment - partnerships	2,458
Other investments, cost	2,434
Unrealized gain	302
Fair value - partnerships	2,736
Certificates of Deposit
Schedule of Cost-Method Investments
Initial investment - certificates of deposit	300
Other investments, cost	300
Unrealized gain	0
Fair value - certificates of deposit	300
DCR Mortgage Fund VI, L.P.
Schedule of Cost-Method Investments
Initial investment - partnerships	627
Other investments, cost	638
Unrealized gain	231
Fair value - partnerships	869
RCH Mortgage Fund VI, L.P.
Schedule of Cost-Method Investments
Initial investment - partnerships	1,000
Other investments, cost	965
Unrealized gain	71
Fair value - partnerships	1,036
Kayne Senior Credit Fund II, L.P.
Schedule of Cost-Method Investments
Initial investment - partnerships	831
Other investments, cost	831
Unrealized gain	0
Fair value - partnerships	$ 831