Related Party Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 300,000	$ 200,000	$ 200,000
Payments for repurchase of common stock	0	42,853,000	15,996,000
West Side Investment Management, Inc [Member]
Related Party Transaction [Line Items]
Stock repurchased during period, shares		1,884,597
Payments for repurchase of common stock		$ 41,008,831