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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  | 12 Months Ended | 67 Months Ended | 110 Months Ended | 126 Months Ended |  |
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Oct. 29, 2015 $ / shares | May. 19, 2015 $ / shares shares | Nov. 04, 2014 $ / shares | Jul. 16, 2014 | May. 02, 2014 $ / shares | Nov. 06, 2013 $ / shares | Jul. 02, 2013 | May. 21, 2013 $ / shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Oct. 31, 2015 USD ($) | May. 18, 2015 shares
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.22 | $ 0.18 | $ 0.13 |  |  |  |  |
Stock split, conversion ratio |  |  |  | 1.5 |  |  | 1.5 |  |  |  |  |  |  |  |  |
Cash dividends paid | $ |  |  |  |  |  |  |  |  | $ 11.9 | $ 9.7 | $ 7.4 |  |  |  |  |
Regular Semi-Annual Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (per share) | $ / shares | $ 0.11 | $ 0.11 | $ 0.09 |  | $ 0.09 | $ 0.07 |  | $ 0.06 |  |  |  |  |  |  |  |
2010 Stock Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized percentage |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
Stock repurchase program amount authorized (in shares) | shares |  |  |  |  |  |  |  |  | 2,900,000 |  |  | 2,900,000 | 2,900,000 | 2,900,000 |  |
Stock repurchase program amount authorized, value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.0 |
Stock repurchased during period (in shares) | shares |  |  |  |  |  |  |  |  | 1,000,000 | 1,000,000 |  | 3,700,000 |  |  |  |
Aggregate price of shares repurchased since inception | $ |  |  |  |  |  |  |  |  |  |  |  | $ 56.5 |  |  |  |
Average price of shares repurchased since inception (per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 15.40 |  |  |  |
2010 Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized (in shares) | shares |  | 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,750,000.00
2005 401(k) Stock Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,500,000 |  |
Aggregate price of shares repurchased since inception | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.9 |  |
Average price of shares repurchased since inception (per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.18 |  |
2006 Director and Officer Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |
Aggregate price of shares repurchased since inception | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.8 |  |  |
Average price of shares repurchased since inception (per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.05 |  |  |

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