Significant Accounting Policies, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		$ 200,790
Ending balance		158,162
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(13,565)	$ 39,747
Ending balance		(16,115)	47,114
Unrealized Losses on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income (loss) before reclassifications, net of tax	[1]	(2,550)	7,367
Net current period other comprehensive income (loss)		(2,550)	7,367
Income tax benefit included in other comprehensive income		$ 0	$ 5,100

[1] Other comprehensive income from the three months ended March 31, 2015 includes income tax expense of $5.1 million. There was no tax benefit for other comprehensive loss for the three months ended March 31, 2016.