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Common Stock and Stockholders' Equity - Performance Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Other disclosures        
Stock-based compensation $ 20,908 $ 17,354 $ 61,151 $ 48,245
PSUs        
Shares        
Outstanding at beginning of period (in shares)     512,482  
Granted (in shares) 0 0 111,199  
Vested and issued (in shares)     (186,455)  
Outstanding at end of period (in shares) 437,226   437,226  
Vested and unissued (in shares) 0   0  
Nonvested (in shares) 437,226   437,226  
Weighted-Average Grant Date Fair Value Per Share        
Outstanding at beginning of period (in dollars per share)     $ 62.51  
Granted (in dollars per share)     117.81  
Vested and issued (in dollars per share)     62.02  
Outstanding at end of period (in dollars per share) $ 76.78   76.78  
Vested and unissued (in dollars per share) 0   0  
Non-vested (in dollars per share) $ 76.78   $ 76.78  
Other disclosures        
Grant date fair value of PSUs granted     $ 13,100 28,500
Stock-based compensation $ 5,900 $ 4,200 16,800 $ 11,000
Unrecognized compensation cost related to non vested $ 20,900   $ 20,900  
Period over which unrecognized compensation cost is expected to be recognized     1 year 8 months 12 days  
PSUs | Minimum        
Common Stock and Stockholders' Equity        
Vesting period     1 year  
Actual performance compared to performance conditions percentage     50.00%  
PSUs | Maximum        
Common Stock and Stockholders' Equity        
Vesting period     3 years  
Actual performance compared to performance conditions percentage     200.00%