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Noncash Share-based Compensation (Details) - shares
Dec. 31, 2018
Dec. 31, 2017
Stock options    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 0 135,000
Restricted stock unit - market-based [Member]    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 215,000  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 215,000 345,000
Restricted Stock Unit - time based [Member]    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1,969,000  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 1,969,000 2,133,000
SARs    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 287,000 356,000
MSUs    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 419,000  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 419,000 387,000
2007 Equity Incentive Plan [Member]    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,908,003  
2017 Equity Incentive Plan [Member] [Member]    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 981,746  
2007 Equity Incentive Plan [Member] | RSUs    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 1,358,819  
2007 Equity Incentive Plan [Member] | SARs    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 287,000  
2007 Equity Incentive Plan [Member] | MSUs    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 262,600  
2017 Equity Incentive Plan [Member] [Member]    
Noncash Share-based Compensation (Narrative) [Line Items]    
Shares reserved for issuance under Plan 2,500,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,347,240  
2017 Equity Incentive Plan [Member] [Member] | RSUs    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 825,178  
2017 Equity Incentive Plan [Member] [Member] | MSUs    
Noncash Share-based Compensation (Narrative) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 156,568