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Summary of Significant Accounting Policies - Anti-dilutive Securities and Segment Information (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2015 item shares | Dec. 31, 2014 shares | Dec. 31, 2013 shares
Segment Information |  |  |
Number of reportable segments | item | 1 |  |
Stock options |  |  |
Anti-dilutive securities excluded from computations of diluted weighted-average common shares outstanding |  |  |
Potentially dilutive securities excluded from computations of diluted weighted-average shares outstanding (in shares) | 5,274 | 4,400 | 3,633
Restricted stock and restricted stock units |  |  |
Anti-dilutive securities excluded from computations of diluted weighted-average common shares outstanding |  |  |
Potentially dilutive securities excluded from computations of diluted weighted-average shares outstanding (in shares) | 44 | 21 | 93

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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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