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Stockholders' Equity (Narrative) (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 02, 2016 | Jun. 17, 2016 | Apr. 15, 2016 | Apr. 10, 2015 | Feb. 29, 2016 | Feb. 28, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options |  |  |  |  |  |  | 171,514 | 237,384 | 219,302 | 284,884
Cash dividend (in usd per share) | $ 0.30 | $ 0.30 | $ 0.3 | $ 2 |  |  |  |  | $ 0.90 |
Payments of dividends | $ 7,400,000 | $ 7,400,000 | $ 7,300,000 |  |  |  |  |  | $ 22,078,000 | $ 48,227,000
Special dividend, stock per share or unit | 0.30 | 0.30 | 0.30 | $ 2.00 |  |  |  |  |  |
Dividend equivalents on stock-based awards | $ 300,000 | $ 300,000 | $ 300,000 |  |  |  |  |  |  |
Reduction in exercise price for all outstanding stock options |  |  |  | $ 2.00 |  |  |  |  |  |
Deferred stock units issued to executive officers |  |  |  |  | 4,784 | 36,579 |  |  |  |
Deferred stock units issued to executive officers, aggregate fair value |  |  |  |  | $ 300,000 | $ 2,000,000 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of dividends |  |  |  | $ 48,200,000 |  |  |  |  |  |
Deferred Stock Units, Restricted Stock and Stock Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend equivalents on stock-based awards |  |  |  | $ 1,800,000 |  |  |  |  |  |
Weighted Average |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred stock units issued to executive officers, exercise price |  |  |  |  | $ 55.22 | $ 55.95 |  |  |  |

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