Stock-Based Incentive Plans Schedule of Grants by Type (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Total Grants During the Period	1,368,000,000	6,022,000,000
Share-based Compensation Arrangement by Share-based Payment Award, All Grants, Fair Value	$ 2,930,000	$ 12,152,000
Employee Service Share-based Compensation, Awards with Performance Condiditons, Compensation Cost Not yet Recognized	$ 0
Unvested Shares with Market Based Vesting Conditions	1,687,500
Employee Service Share-based Compensation, Awards with market Cond, Compensation Cost Not yet Recognized	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	1,368,000
Share-based Compensation Arrangment by Share-based Payment Award, Options, Granted, Fair Value	$ 2,930,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market Based Vesting Conditions, price	$ 7.00
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market Based Vesting Conditions, price	$ 10.00
Time Based Vesting Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	1,368,000,000	3,434,000,000
Share-based Compensation Arrangment by Share-based Payment Award, Options, Granted, Fair Value	$ 2,930,000	$ 5,704,000
Market Based Vesting Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	2,250,000,000
Share-based Compensation Arrangment by Share-based Payment Award, Options, Granted, Fair Value	$ 0	$ 5,530,000
Performance Based Vesting Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0	138,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Awards, Granted, Fair Value	$ 0	$ 431,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	200,000,000
Share-based Compensation Arrangment by Share-based Payment Award, Options, Granted, Fair Value	$ 0	$ 487,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments With Performance Conditions, Nonvested, Number,	102,000