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Share-Based Payments - Summary of Grants of RSUs (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Apr. 30, 2013
Shares Vesting [Member]
Feb. 28, 2013
Shares Vesting [Member]
Jun. 30, 2013
Shares Vesting [Member]
May 31, 2013
RSU Vesting [Member]
Feb. 28, 2013
RSU Vesting [Member]
Jun. 30, 2013
RSU Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Date April 2013 February 2013   May 2013 February 2013  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 11,304 20,000 31,304 15,000 180,000 195,000
Estimated Fair Value on Grant Date $ 200 $ 352   $ 261 $ 3,166  
Initial Vesting Jul. 01, 2013 Dec. 01, 2013   Dec. 01, 2013 Dec. 01, 2013  
Final Vesting Apr. 01, 2016 Dec. 01, 2015   Dec. 01, 2015 Dec. 01, 2015