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Summary of Operations and Significant Accounting Policies (Details 8)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Net Income Per Share        
Number of shares to purchase, the effect of which is included in diluted net income available to common stockholders/members 2,136,637 1,589,748 2,161,146 1,717,767
Anti-dilutive shares excluded from diluted net income available to common stockholders/members 617,250 376,550 472,977 229,367
Reconciliation of assumed exercised shares used in calculating basic and diluted net income (loss) share available to common shareholders/members        
Basic (in shares) 35,304,066 33,692,876 35,161,644 33,522,289
Stock options and employee stock purchase plan shares 552,282 536,741 627,845 444,556
Unvested restricted stock awards 75,106 51,039 93,713 76,728
Diluted (in shares) 35,931,454 34,280,656 35,883,202 34,043,573