Stock Based Compensation RSU Rollforward (Details) - RSUs [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
RSU Rollforward [Line Items]
Unvested RSUs Outstanding	590,842	678,803
RSU Awards Granted	322,227
Vested	(368,428)
Forfeited	(41,760)
Weighted Average Grant Date Fair Value (RSUs)	$ 38.49	$ 32.98	$ 27.73
Weighted Average Grant Date Fair Value of RSU's Granted During the Period	42.15	$ 37.28	$ 29.98
Weighted Average Grant Date Fair Value of Vested RSUs	31.66
Weighted Average Grant Date Fair Value of RSUs forfeited	$ 37.47
RSU Compensation expense recognized	$ 12,500	$ 12,100	$ 11,000
RSUs unrecognized compensation expense	$ 6,300
RSUs unrecognized compensation expense, weighted average recognition period	1 year 8 months 12 days
RSUs Aggregate Intrinsic Value, Vested	$ 11,700	$ 15,400	$ 17,700

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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