Reinsurance (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Premiums Written and Earned [Abstract]
Ceded premiums written, net of profit commission		$ 58,055	$ 44,689
Ceded premiums earned, net of profit commission		47,567	40,594
Ceded losses incurred		6,060	5,658
Ceding commissions	[1]	21,803	17,877
Ceded unearned premiums		57,842	$ 39,946
Profit commission receivable		$ 142,457		$ 91,500
Period of existing captive reinsurance agreement		10 years
Reinsurance recoverable on loss reserves related to captive agreements		$ 38,000		45,000
Fair value of trust fund assets under captive agreements		$ 163,000		$ 198,000

[1] Ceding commissions are reported within Other underwriting and operating expenses, net on the consolidated statements of operations.