Stock-Based Compensation (Schedule of Fair Value of the Restricted Stock Awards Granted During the Periods) (Details) - Restricted Stock [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) shares
Time Vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	925,673
Estimated fair value (in millions) | $	$ 14,600	[1]
Time Vested [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	925,673
Estimated fair value (in millions) | $	$ 14,600	[1]
Percentage of shares granted expected to be distributed	95.00%
Time Vested [Member] | Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	0
Estimated fair value (in millions) | $	$ 0	[1]
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	424,070
Estimated fair value (in millions) | $	$ 7,100	[1]
Performance Shares [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	424,070
Estimated fair value (in millions) | $	$ 7,100	[1]
Percentage of shares granted expected to be distributed	64.00%
Performance Shares [Member] | Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	0
Estimated fair value (in millions) | $	$ 0	[1]

[1] The performance shares represent 100% of the grant date fair value. (We recognize the grant date fair value minus estimated forfeitures.)