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Stock Based Compensation Non Cash Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The non-cash stock-based compensation expense for the years ended December 31 is as follows:
(in thousands)
 
2016
 
2015
 
2014
Stock Incentive Plan
 
$
11,049

 
$
11,111

 
$
14,447

Employee Stock Purchase Plan
 
3,698

 
3,430

 
2,425

Performance Stock Plan
 
1,305

 
972

 
2,354

Incentive Stock Option Plan
 
—

 
—

 
137

Total
 
$
16,052

 
$
15,513

 
$
19,363

    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation $ 16,052 $ 15,513 $ 19,363
Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation 11,049 11,111 14,447
PerformanceStock​Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation 1,305 972 2,354
Incentive Stock Option Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation 0 0 137
Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation $ 3,698 $ 3,430 $ 2,425