Investments (Balance of and Changes in AOCI Components) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning		$ 84,622
Balance, ending	$ 66,261	66,261		$ 84,622
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning		(30)	$ 10	10
Change in other comprehensive income before reclassifications		(40)	(4)
Amounts reclassified from AOCI		0	0
Income tax benefit (expense)		14	2
Balance, ending	(56)	(56)	8	(30)	$ 10
Net Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning		84,652	70,857	70,857
Change in other comprehensive income before reclassifications		(23,240)	36,495
Amounts reclassified from AOCI	(3,042)	(4,904)	(877)
Income tax benefit (expense)		9,809	(12,467)
Balance, ending	66,317	66,317	94,008	84,652	70,857
Cash Flow Hedge Gain (Loss) To AOCI		10,000	(4,000)	5,000	(4,000)
Total Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning		84,622	70,867	70,867
Change in other comprehensive income before reclassifications		(23,280)	36,491
Amounts reclassified from AOCI	(3,042)	(4,904)	(877)
Income tax benefit (expense)		9,823	(12,465)
Balance, ending	$ 66,261	$ 66,261	$ 94,016	$ 84,622	$ 70,867