Shareholders' Equity Initial Public Offering (Textual) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	May 08, 2012	Dec. 31, 2011
Shareholders’ Equity [Abstract]
Common Stock Issued, Initial Public Offering		22,103,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01
Common Stock Issued, Shares, Underwriter Option Exercised, Initial Public Offering		2,883,000
Sale of Stock, Price Per Share		$ 10
Proceeds from Issuance Initial Public Offering, Net of Underwriter Fees and IPO Costs	$ 198,464