Stock-Based Compensation - Other Stock Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Stock-Based Compensation
Total stock-based compensation expense (in dollars)	$ 7,137	$ 6,852
Other stock awards
Stock-Based Compensation
Granted (in shares)	9,386	9,547
Weighted average grant-date fair value (in dollars per share)	$ 52.29	$ 56.31
Total stock-based compensation expense (in dollars)	$ 491	$ 538

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Publisher FASB
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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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