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Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 49 Months Ended 6 Months Ended 108 Months Ended 6 Months Ended 92 Months Ended
Jun. 05, 2014
May 21, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jul. 16, 2014
Subsequent Event [Member]
May 02, 2014
Regular Semi-Annual Dividend
Nov. 06, 2013
Regular Semi-Annual Dividend
May 21, 2013
Regular Semi-Annual Dividend
May 17, 2010
2010 Stock Repurchase Program
Jun. 30, 2014
2010 Stock Repurchase Program
Jun. 30, 2014
2005 401(k) Stock Repurchase Program
Jun. 30, 2013
2005 401(k) Stock Repurchase Program
Jun. 30, 2014
2005 401(k) Stock Repurchase Program
Jun. 30, 2014
2006 Director and Officer Repurchase Program
Jun. 30, 2013
2006 Director and Officer Repurchase Program
Jun. 30, 2014
2006 Director and Officer Repurchase Program
Schedule of Shareholders' Equity [Line Items]                                    
Stock repurchase program authorized percentage                     5.00%              
Stock repurchase program amount authorized (in shares)                     2,800,000              
Stock repurchased during period (in shares)                       1,600,000 200,000 200,000 4,800,000 40,000 40,000 1,800,000
Aggregate price of shares repurchased since inception                       $ 11.5     $ 35.3     $ 14.0
Average price of shares repurchased since inception (per share)                       $ 7.13     $ 7.31     $ 7.76
Dividends declared (per share)     $ 0.09 [1] $ 0.07 [1] $ 0.09 [1] $ 0.07 [1]   $ 0.09 $ 0.07 $ 0.07                
Stock split, conversion ratio 1.5 1.5         1.5                      
[1] Reflects three-for-two stock split effective July 16, 2014