Equity Incentive Plan - Restricted share activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value, at beginning of the period (in dollars per share)	$ 0
Weighted Average Grant Date Fair Value, at end of the period (in dollars per share)		$ 0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Outstanding, at beginning of the period	175	194	212
Shares Outstanding, granted	87	52	54
Shares Outstanding, vested	(64)	(68)	(70)
Shares Outstanding, forfeited	(23)	(3)	(2)
Shares Outstanding, at end of the period	175	175	194
Weighted Average Grant Date Fair Value, at beginning of the period (in dollars per share)	$ 60.53	$ 50.71	$ 42.74
Weighted Average Grant Date Fair Value, granted (in dollars per share)	65.23	78.43	65.85
Weighted Average Grant Date Fair Value, vested (in dollars per share)	53.82	45.78	39.55
Weighted Average Grant Date Fair Value, forfeited (in dollars per share)	63.88	63.80	54.08
Weighted Average Grant Date Fair Value, at end of the period (in dollars per share)	$ 64.90	$ 60.53	$ 50.71