Investments - Schedule of Investments in Limited Partnerships (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Schedule of Cost-Method Investments
Other investments, cost	$ 395,105	$ 375,090
Unrealized gain	7,536	8,230
Other Long-Term Investments
Schedule of Cost-Method Investments
Total other investments	2,881
Other investments, cost	2,840	2,749
Unrealized gain	291	261
Other long-term investments	3,131	$ 3,010
Limited Partnership
Schedule of Cost-Method Investments
Initial investment - partnerships	2,581
Other investments, cost	2,540
Unrealized gain	291
Fair value - partnerships	2,831
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	750
Other investments, cost	749
Unrealized gain	215
Fair value - partnerships	964
RCH Mortgage Fund VI, L.P.
Schedule of Cost-Method Investments
Initial investment - partnerships	1,000
Other investments, cost	960
Unrealized gain	76
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