Stockholders' Equity - Schedule of Stock Repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Stockholders Equity [Line Items]
Total cost	$ 51,053	$ 50,311	$ 48,332	$ 21,883
2016 Stock Repurchase Program
Stockholders Equity [Line Items]
Shares of common stock repurchased and retired (in shares)	471		580		921	908
Average price paid per share (in dollars per share)	$ 108.41		$ 83.34		$ 110.03	$ 77.33
Total cost	$ 51,043		$ 48,320		$ 101,344	$ 70,197

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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