Significant Accounting Policies, Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Summary of changes in accumulated other comprehensive income [Roll Forward]
Beginning balance accumulated other comprehensive income	$ 24,719,000		$ 26,986,000		$ 21,080,000		$ 12,480,000
Unrealized (losses) gains on securities, net of tax	(6,994,000)	[1]	2,207,000	[1]	(3,189,000)	[1]	17,876,000	[1]
Amounts reclassified from accumulated other comprehensive income	(831,000)	[2]	(172,000)	[2]	(997,000)	[2]	(1,335,000)	[2]
Net current period other comprehensive (loss) income	(7,825,000)		2,035,000		(4,186,000)		16,541,000
Ending balance accumulated other comprehensive income	16,894,000		29,021,000		16,894,000		29,021,000
Income tax expense (benefit) included in other comprehensive income	$ (2,500,000)		$ 1,400,000		$ 0		$ 11,400,000

[1] Other comprehensive (loss) income for the three months ended September 30, 2014 included income tax benefit of $2.5 million, compared to income tax expense of $1.4 million and $11.4 million for the three and nine months ended September 30, 2013, respectively. We recorded no income tax benefit or expense for the nine months ended September 30, 2014.

[2] Included in gain on investments, net on our condensed consolidated statement of operations.