Capital Stock and Equity Awards - Summary of Option Activity (Details) - $ / shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Shares
Exercised (in shares)	(29,141)
Weighted- Average Exercise Price
Weighted-average remaining contractual life of options outstanding	2 years 4 months 24 days
Weighted-average remaining contractual life of options exercisable	2 years 4 months 24 days
Options
Shares
Beginning of period (in shares)	643,851	1,115,324
Granted (in shares)	0	0
Exercised (in shares)	(29,141)	(336,350)
Forfeited (in shares)	0	(5,395)
End of period (in shares)	614,710	773,579
Exercisable, end of period (in shares)	614,710	717,610
Weighted- Average Exercise Price
Beginning of period (in dollars per share)	$ 30.41	$ 29.02
Granted (in dollars per share)	0	0
Exercised (in dollars per share)	28.78	26.22
Forfeited (in dollars per share)	0	38.13
End of period (in dollars per share)	30.49	30.18
Exercisable, end of period (in dollars per share)	$ 30.49	$ 29.24
Contractual life (in years)	7 years
Minimum | Options
Weighted- Average Exercise Price
Vesting period (in years)	3 years
Maximum | Options
Weighted- Average Exercise Price
Vesting period (in years)	4 years