Accumulated Other Comprehensive Income ("AOCI") (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014
Components of accumulated other comprehensive income
Begining Balance		$ 45,122		$ (64,982)
Other comprehensive income before reclassifications		(14,593)		$ 5,390
Amounts reclassified from AOCI		(32,435)	[1]
Net current-period other comprehensive income		(47,028)		$ 5,390
Ending Balance		(1,906)		(59,592)
Foreign Currency Translation Adjustments [Member]
Components of accumulated other comprehensive income
Begining Balance		329		(90,977)
Other comprehensive income before reclassifications		$ (8,536)		$ (2,721)
Amounts reclassified from AOCI
Net current-period other comprehensive income		$ (8,536)		$ (2,721)
Ending Balance		(8,207)		(93,698)
Unrealized Gains on Available-for- Sale Investments [Member]
Components of accumulated other comprehensive income
Begining Balance		46,197		25,995
Other comprehensive income before reclassifications		(6,112)		$ 8,111
Amounts reclassified from AOCI		(32,435)	[1]
Net current-period other comprehensive income		(38,547)		$ 8,111
Ending Balance		7,650		$ 34,106
Unrealized Gain/(Loss) on Interest Rate Swaps [Member]
Components of accumulated other comprehensive income
Begining Balance		(1,404)
Other comprehensive income before reclassifications		$ 55
Amounts reclassified from AOCI	[1]
Net current-period other comprehensive income		$ 55
Ending Balance		$ (1,349)

[1] Amounts reclassified to Interest, dividends and other investment income on the Company's Condensed Consolidated Statements of Income.