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Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 52 Months Ended | 9 Months Ended | 111 Months Ended | 9 Months Ended | 95 Months Ended
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Jul. 16, 2014 | Jun. 05, 2014 | May 21, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | May 02, 2014 Regular Semi-Annual Dividend | Nov. 06, 2013 Regular Semi-Annual Dividend | May 21, 2013 Regular Semi-Annual Dividend | Nov. 04, 2014 Subsequent Event [Member] Regular Semi-Annual Dividend | May 17, 2010 2010 Stock Repurchase Program | Sep. 30, 2013 2010 Stock Repurchase Program | Sep. 30, 2014 2010 Stock Repurchase Program | Sep. 30, 2014 2005 401(k) Stock Repurchase Program | Sep. 30, 2013 2005 401(k) Stock Repurchase Program | Sep. 30, 2014 2005 401(k) Stock Repurchase Program | Sep. 30, 2014 2006 Director and Officer Repurchase Program | Sep. 30, 2013 2006 Director and Officer Repurchase Program | Sep. 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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 2,100,000 | 300,000 | 300,000 | 4,900,000 | 40,000 | 40,000 | 1,800,000
Aggregate price of shares repurchased since inception |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.3 |  |  | $ 37.6 |  |  | $ 14.0
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.95 |  |  | $ 7.60 |  |  | $ 7.76
Stock split, conversion ratio | 1.5 | 1.5 | 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (per share) |  |  |  | $ 0 | [1] | $ 0 | [1] | $ 0.09 | [1] | $ 0.07 | [1] | $ 0.09 | $ 0.07 | $ 0.07 | $ 0.09 |  |  |  |  |  |  |  |  |
[1] | Reflects three-for-two stock split effective July 16, 2014

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