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Earnings (Loss) Per Share - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May. 31, 2015 | May. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Aug. 12, 2015 | Apr. 24, 2014 | Mar. 05, 2014 | Jun. 24, 2013 | Nov. 27, 2012
Equity, Treasury Stock, Stock Repurchase Program [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, amount authorized |  |  |  |  |  | $ 50,000,000.0 | $ 50,000,000.0 |  |  |
Stock repurchased during period (shares) | 839,295 | 400,000 |  |  |  |  |  |  |  |
Stock repurchased during period (value) | $ 33,200,000 | $ 16,800,000 |  |  |  |  |  |  |  |
Dilutive and Anti-dilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Anti-dilutive securities, employee stock options excluded from EPS |  |  | 0 | 0 | 0 |  |  |  |  |
2017 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Dilutive and Anti-dilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Debt component |  |  |  | $ 115,000,000 |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  | $ 31.56 |  |  |  |  |  | $ 31.56
2017 Convertible Senior Notes [Member] | Adjusted Debt Conversion Rate Following Hedge Transactions [Member] |  |  |  |  |  |  |  |  |  |
Dilutive and Anti-dilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  | $ 60.00 |  |  |  |  |  |
2020 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Dilutive and Anti-dilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Debt component |  |  |  | $ 172,500,000 |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  | $ 45.72 |  |  |  |  | $ 45.72 |
2020 Convertible Senior Notes [Member] | Adjusted Debt Conversion Rate Following Hedge Transactions [Member] |  |  |  |  |  |  |  |  |  |
Dilutive and Anti-dilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  | $ 61.55 |  |  |  |  |  |
2021 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Dilutive and Anti-dilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Debt component |  |  |  | $ 161,000,000 |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  | $ 59.39 |  |  |  | $ 59.39 |  |
2021 Convertible Senior Notes [Member] | Adjusted Debt Conversion Rate Following Hedge Transactions [Member] |  |  |  |  |  |  |  |  |  |
Dilutive and Anti-dilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  | $ 83.14 |  |  |  |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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