Stock-Based Compensation - Stock Compensation Plans (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Stock Options Outstanding
Stock options outstanding, number of shares, balance (in shares) | shares	658
Stock options exercised, exercised (in shares) | shares	(183)
Stock options forfeited/expired (in shares) | shares	0
Stock options outstanding, number of shares, balance (in shares) | shares	475
Stock options outstanding, number of shares, exercisable (in shares) | shares	475
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock options, weighted average exercise price, balance (in dollars per share) | $ / shares	$ 22.48
Stock options, weighted average exercise price, exercised (in dollars per share) | $ / shares	22.50
Stock options, weighted average exercise price, forfeited/expired (in dollars per share) | $ / shares	0
Stock options, weighted average exercise price, balance (in dollars per share) | $ / shares	22.47
Stock options outstanding, weighted average exercise price, exercisable (in dollars per share) | $ / shares	$ 22.47
Non-vested Stock Awards Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested shares outstanding, balance (in shares) | shares	5
Non-vested shares outstanding, granted (in shares) | shares	0
Non-vested shares outstanding, vested (earned) (in shares) | shares	(3)
Non-vested shares outstanding, forfeited/expired (in shares) | shares	0
Non-vested shares outstanding, balance (in shares) | shares	2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested shares outstanding. weighted-average grant-date fair value, balance (in dollars per share) | $ / shares	$ 22.35
Non-vested shares outstanding. weighted-average grant-date fair value, granted (in dollars per share) | $ / shares	0
Non-vested shares outstanding. weighted-average grant-date fair value, vested (earned) (in dollars per share) | $ / shares	22.48
Non-vested shares outstanding. weighted-average grant-date fair value, forfeited/expired (in dollars per share) | $ / shares	0
Non-vested shares outstanding. weighted-average grant-date fair value, balance (in dollars per share) | $ / shares	$ 22.20
Non-vested Stock Units Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested shares outstanding, balance (in shares) | shares	1,032
Non-vested shares outstanding, granted (in shares) | shares	474
Non-vested shares outstanding, vested (earned) (in shares) | shares	(302)
Non-vested shares outstanding, forfeited/expired (in shares) | shares	(60)
Non-vested shares outstanding, balance (in shares) | shares	1,144
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested shares outstanding. weighted-average grant-date fair value, balance (in dollars per share) | $ / shares	$ 24.53
Non-vested shares outstanding. weighted-average grant-date fair value, granted (in dollars per share) | $ / shares	29.18
Non-vested shares outstanding. weighted-average grant-date fair value, vested (earned) (in dollars per share) | $ / shares	25.77
Non-vested shares outstanding. weighted-average grant-date fair value, forfeited/expired (in dollars per share) | $ / shares	26.02
Non-vested shares outstanding. weighted-average grant-date fair value, balance (in dollars per share) | $ / shares	$ 26.02