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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	$ 381,569	$ 378,609	$ 310,544	$ 369,338
Total unrealized (losses) gains
Included in net investment income	(404)	10,796	4,584	29,446
Included in other income (loss)	(348)	2,220	348	2,220
Total realized gains (losses)
Included in other income (loss)	1,512		2,828
Total foreign exchange gains (losses)	648	(226)	(1,844)	(253)
Purchases	6,681	10,391	92,840	25,392
Settlements	(30,616)	(20,394)	(49,562)	(44,747)
Balance at end of the period	359,042	381,396	359,042	381,396
Net investment income
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	(404)	10,617	4,584	29,446
Other income (loss)
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	(348)	2,220	(348)	2,220
Fixed maturity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	15,474	37,138	15,660	27,580
Total unrealized (losses) gains
Included in net investment income	(314)	9,038	(500)	18,596
Included in other income (loss)	0	0	0	0
Total realized gains (losses)
Included in other income (loss)	0		0
Total foreign exchange gains (losses)	0	0	0	0
Purchases	0	0	0	0
Settlements	(7,500)	0	(7,500)	0
Balance at end of the period	7,660	46,176	7,660	46,176
Fixed maturity investments | Net investment income
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	(132)	9,038	(318)	18,596
Fixed maturity investments | Other income (loss)
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	0	0	0	0
Other Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	293,126	342,778	303,818	344,248
Total unrealized (losses) gains
Included in net investment income	(106)	1,579	4,908	9,455
Included in other income (loss)	0	0	0	0
Total realized gains (losses)
Included in other income (loss)	0		0
Total foreign exchange gains (losses)	654	(205)	(1,844)	(199)
Purchases	5,137	10,391	10,875	25,392
Settlements	(23,116)	(20,394)	(42,062)	(44,747)
Balance at end of the period	275,695	334,149	275,695	334,149
Other Investments | Net investment income
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	(106)	1,579	4,908	9,455
Other Investments | Other income (loss)
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	0	0	0	0
Other assets and liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	72,969	(1,307)	(8,934)	(2,490)
Total unrealized (losses) gains
Included in net investment income	16	179	176	1,395
Included in other income (loss)	(348)	2,220	348	2,220
Total realized gains (losses)
Included in other income (loss)	1,512		2,828
Total foreign exchange gains (losses)	(6)	(21)	0	(54)
Purchases	1,544	0	81,965	0
Settlements	0	0	0	0
Balance at end of the period	75,687	1,071	75,687	1,071
Other assets and liabilities | Net investment income
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	16	0	176	1,395
Other assets and liabilities | Other income (loss)
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	$ (348)	$ 2,220	$ (348)	$ 2,220

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