Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Stock-Based Compensation [Abstract]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

The following table summarizes our restricted stock award activity for the years ended December 31, 2021, 2020 and 2019. The vesting dates for the awards vested in 2021 occurred relatively evenly throughout the year ended December 31, 2021. The fair value of awards vested during 2021, 2020 and 2019 was $1.5 million, $2.3 million and $1.8 million, respectively.

	2021
	Number of Restricted Stock Awards ( in thousands)	Weighted Average Grant Date Fair Value
Unvested at January 1	59.7	$	20.29
Granted	32.1	17.92
Vested	(77.8)	19.42
Forfeited	—	—
Outstanding (unvested) at end of year	14.0	$	19.70

	2020
	Number of Restricted Stock Awards ( in thousands)	Weighted Average Grant Date Fair Value
Unvested at January 1	52.1	$	20.55
Granted	119.9	20.24
Vested	(111.8)	20.38
Forfeited	(0.5)	19.32
Outstanding (unvested) at end of year	59.7	$	20.29

	2019
	Number of Restricted Stock Awards (in thousands)	Weighted Average Grant Date Fair Value
Unvested at beginning of year	26.5	$	21.31
Granted	114.0	19.88
Vested	(87.9)	19.93
Forfeited	(0.5)	17.11
Outstanding (unvested) at end of year	52.1	$	20.55