Stock-Based Compensation - Stock Compensation Plans (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Stock Options Outstanding
Stock options outstanding, number of shares, balance (in shares) | shares	658
Stock options exercised, exercised (in shares) | shares	(166)
Stock options forfeited/expired (in shares) | shares	0
Stock options outstanding, number of shares, balance (in shares) | shares	492
Stock options outstanding, number of shares, exercisable (in shares) | shares	492
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	22.47
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	22.48
Stock options outstanding, weighted average exercise price, exercisable (in dollars per share) | $ / shares	$ 22.48
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	(2)
Non-vested shares outstanding, forfeited/expired (in shares) | shares	0
Non-vested shares outstanding, balance (in shares) | shares	3
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	22.20
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	$ 22.48
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	202
Non-vested shares outstanding, vested (earned) (in shares) | shares	(272)
Non-vested shares outstanding, forfeited/expired (in shares) | shares	(27)
Non-vested shares outstanding, balance (in shares) | shares	935
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	29.65
Non-vested shares outstanding. weighted-average grant-date fair value, vested (earned) (in dollars per share) | $ / shares	25.74
Non-vested shares outstanding. weighted-average grant-date fair value, forfeited/expired (in dollars per share) | $ / shares	25.56
Non-vested shares outstanding. weighted-average grant-date fair value, balance (in dollars per share) | $ / shares	$ 25.21