Financing Receivables - Schedule of Activity of Allowance for Uncollectible Accounts on Agent Receivables (Details) (Agent receivables, net, USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Agent receivables, net
   
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning of year $ 2,003 $ 2,245
Additions 13 306
Deductions (297) (548)
End of period $ 1,719 $ 2,003