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Stock Incentive Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Incentive Plans (Textuals) [Abstract]
Number of common stock authorized for Long-Term Incentive Plan (in shares)	10,000,000
Options expiration period	10 years
Compensation expense	$ 28,318	$ 25,047	$ 27,646
Stock Option \| Maximum
Stock Incentive Plans (Textuals) [Abstract]
Vesting period for options	4 years
Stock Option \| Minimum
Stock Incentive Plans (Textuals) [Abstract]
Vesting period for options	3 years
Restricted Stock
Stock Incentive Plans (Textuals) [Abstract]
Expected recognized period	2 years
Restricted Stock \| Maximum
Stock Incentive Plans (Textuals) [Abstract]
Vesting period for options	3 years
Restricted Stock \| Stock Option Restricted Stock Deferred Stock Units and Dividend Equivalent Rights
Stock Incentive Plans (Textuals) [Abstract]
Unrecognized compensation cost related to unvested stock options granted stock under our stock incentive plans	$ 20,900