Quarterly Results of Operations (Unaudited) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
QuarterlyFinancialDataAbstract
Total revenues	$ 311,249	$ 290,576
Total benefits and expenses	216,896	93,190
Income Loss From Continuing Operations Before Income Taxes And Operating Joint Ventures	94,353	197,386
Net income	$ 77,498	$ 147,388