Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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Stock Incentive Plans.

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Stock Incentive Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	May 31, 2016
Stock Incentive Plans (Textuals) [Abstract]
Number of common stock authorized for Long-Term Incentive Plan		10,000,000
Stock options \| Long Term Incentive Plan
Stock Incentive Plans (Textuals) [Abstract]
Options expiration period	10 years
Stock options \| Maximum
Stock Incentive Plans (Textuals) [Abstract]
Vesting period	5 years
Stock options \| Minimum
Stock Incentive Plans (Textuals) [Abstract]
Vesting period	3 years
Restricted stock
Stock Incentive Plans (Textuals) [Abstract]
Expected recognized period	2 years
Restricted stock \| Maximum
Stock Incentive Plans (Textuals) [Abstract]
Vesting period	3 years
Restricted stock \| Minimum
Stock Incentive Plans (Textuals) [Abstract]
Vesting period	2 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	$ 30,755
Expected recognized period	2 years