Stock Compensation (Tables)	12 Months Ended
	Dec. 31, 2021
Stock Compensation [Abstract]
Schedule Of Shares Available For Grant	Authorized Available for GrantPlan Shares 2021 20201996 Discounted Employee Stock Purchase Plan, as amended 1,900,000 63,000 150,0002009 Equity and Cash Incentive Plan 7,570,000 -- 52,0002020 Equity and Cash Incentive Plan 4,105,000 3,310,000 4,094,000Total 13,575,000 3,373,000 4,296,000
Schedule Of Stock Grant Activity For RSAs	Weighted Average Grant DateRSAs Shares Fair ValueUnvested at December 31, 2018 326,000 $ 17.19Granted 93,000 29.77Vested (149,000) 14.45Forfeited (27,000) 20.53Unvested at December 31, 2019 243,000 23.30Granted 123,000 24.70Vested (108,000) 20.66Unvested at December 31, 2020 258,000 25.08Granted 140,000 25.68Vested (130,000) 22.40Forfeited (33,000) 27.39Unvested at December 31, 2021 235,000 26.59
Schedule Of Stock Grant Activity For RSUs	Weighted Average Remaining Aggregate Contractual IntrinsicRSUs Shares Term in years ValueUnvested at December 31, 2018 251,000 1.05 $ 7,123,000Granted 103,000 Vested (101,000) Forfeited (27,000) Unvested at December 31, 2019 226,000 0.93 6,131,000Granted 141,000 Vested (118,000) Forfeited (37,000) Unvested at December 31, 2020 212,000 1.02 5,015,000Granted 144,000 Vested (93,000) Forfeited (39,000) Unvested at December 31, 2021 224,000 0.94 4,558,000 Vested and expected to vest 224,000 0.94 $ 4,558,000
Schedule Of Stock Grant Activity For PSUs	Weighted Average Remaining Aggregate Contractual IntrinsicPSUs Shares Term in years ValueUnvested at December 31, 2018 147,000 0.72 $ 4,179,000Granted 322,000 Vested (87,000) Forfeited (35,000) Unvested at December 31, 2019 347,000 2.33 9,400,000Granted 70,000 Vested (55,000) Forfeited (31,000) Unvested at December 31, 2020 331,000 1.64 7,805,000Granted 215,000 Vested (60,000) Forfeited (114,000) Unvested at December 31, 2021 372,000 0.90 7,579,000 Vested and expected to vest 372,000 0.90 $ 7,579,000
Summary Of Stock Option Activity	Weighted Average Weighted Remaining Aggregate Average Contractual Intrinsic Shares Exercise Price Term in years ValueOutstanding at December 31, 2018 1,333,000 $ 13.04 3.93 $ 20,439,000Granted 169,000 29.62 Exercised (334,000) 9.87 Forfeited (39,000) 22.64 Outstanding at December 31, 2019 1,129,000 16.14 3.67 12,763,000Granted 212,000 26.24 Exercised (88,000) 10.49 Forfeited (12,000) 27.36 Outstanding at December 31, 2020 1,241,000 18.16 3.38 8,215,000Granted 226,000 24.90 Exercised (179,000) 12.02 Forfeited (42,000) 26.00 Outstanding at December 31, 2021 1,246,000 20.00 3.20 4,038,931 Vested and expected to vest 1,246,000 $ 20.00 3.20 $ 4,038,931Exercisable at December 31, 2021 873,000 $ 17.48 2.19 $ 4,038,931
Summary Of Other Information Concerning Stock Options	2021 2020 2019Weighted-average fair value of options granted$8.82 $8.64 $ 11.47Intrinsic value of options exercised 2,716,000 1,267,000 6,519,000
Schedule Of Weighted-Average Assumptions Used To Determine The Fair Value Of Options	2021 2020 2019 Stock ESPP Stock ESPP Stock ESPP Options Options Options Options Options OptionsExpected life of options5.00 Years 0.50 Years 5.00 Years 0.50 Years 5.00 Years 0.50 YearsExpected stock price volatility0.40 0.45 0.35 0.52 0.40 0.39Risk-free interest rate0.57% 0.07% 1.41% 1.00% 2.54% 2.35%
Summary Of Total Stock Compensation Expenses	2021 2020 2019RSA, RSU, and PSU expense$ 9,023 $ 5,288 $ 7,451Stock option and ESPP option expense 2,254 2,216 1,960Total stock compensation expense$ 11,277 $ 7,504 $ 9,411