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Net Loss Per Share (Anti-Dilutive Common Share Equivalents) (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti–dilutive common share equivalents (in shares) 1,599,196 1,292,328 1,104,155
Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti–dilutive common share equivalents (in shares) 759,719 778,385 665,216
Restricted Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti–dilutive common share equivalents (in shares) 839,477 513,943 438,939