v2.4.0.8
Stockholders' Equity , Share Repurchase Program (Details) (USD $)
0 Months Ended 12 Months Ended
Dec. 06, 2013
Dec. 31, 2013
Dec. 31, 2009
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Stock repurchase program, authorized amount $ 200,000,000    
Stock repurchased in the period, shares   2,100,000 1,409,264
Stock repurchased in the period, value   38,949,000  
Remaining authorized repurchase amount under the program   $ 161,100,000