Capital Stock and Equity Awards - Summary of Share Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stockholders' Equity Note [Abstract]
Share based compensation expense	$ 2,097	$ 1,779	$ 5,874	$ 5,263
U.S. tax benefit on share based compensation expense	$ 287	$ 211	$ 786	$ 631

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

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