Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Shares of Common Stock Issued Under Employee Stock Purchase Plan (Details)

v3.19.3.a.u2
Stockholders' Equity - Shares of Common Stock Issued Under Employee Stock Purchase Plan (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Number of shares available, beginning balance (in shares)     189,611
Shares issued during period (in shares) 19,895 18,725 18,542
Number of shares available, ending balance (in shares) 132,449    
Weighted average per share price of shares issued (in dollars per share) $ 103.84 $ 71.12 $ 55.40