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Summary of Operations and Significant Accounting Policies - Anti-dilutive Equity Instruments (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total shares excluded from diluted shares outstanding (in shares) 0 355 0
Stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total shares excluded from diluted shares outstanding (in shares) 0 10 0
Restricted stock awards      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total shares excluded from diluted shares outstanding (in shares) 0 163 0
Performance share units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total shares excluded from diluted shares outstanding (in shares) 0 182 0