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Net Income (Loss) Per Share and Stockholders' Equity, Narrative (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 07, 2016 | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Apr. 22, 2016 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Fully-vested options outstanding |  | 1,543 | 16,645 |  |
Average exercise price per share | $ / shares |  |  | $ 80.01 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  | $ 60.70 |
Payment of cash dividends to stockholders | $ |  | $ 32.4 | $ 28.1 | $ 25.4 |
Payment of quarterly cash dividends | $ / shares |  | $ 1.80 | $ 1.60 | $ 1.40 |
Repurchase of common shares pursuant to an authorization from the Board, shares |  | 443,838 | 647,520 | 633,230 |
Weighted-average price of repurchases of common shares | $ / shares |  | $ 78.59 | $ 76.35 | $ 70.87 |
Repurchase of common shares pursuant to an authorization from the Board, value | $ |  | $ 34.9 | $ 49.4 | $ 44.9 |
Common shares available for additional share repurchase | $ |  | $ 88.4 | $ 123.3 |  |
Preferred Stock, Shares Authorized |  | 5,000,000 | 5,000,000 |  |
Common Stock |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock Issued During Period, Shares, Other |  |  | 1,015,185 |  |
Repurchase of common shares pursuant to an authorization from the Board, shares |  | 443,838 | 647,520 | 633,230 |
Convertible Notes | Convertible Notes Payable |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock Issued During Period, Shares, Other |  |  | 1,015,185 |  |
Warrant Transactions |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Number of common shares underlying the Warrants outstanding |  |  |  | 3,700,000 |
Series A Preferred Stock [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Preferred Stock, Rights Conversion Ratio into Preferred Stock | 1 |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  | 900,000

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