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Accounts Receivable Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts receivable consist of the following at December 31, 2015 and 2014:
(in thousands)
 
2015
 
2014
Trade receivables
 
$
311,932

 
$
128,672

Allowance for doubtful accounts
 
(2,357
)
 
(1,560
)
Other allowances
 
(6,399
)
 
(460
)
 
 
$
303,176

 
$
126,652
Allowance for Credit Losses on Financing Receivables [Table Text Block]
The following table shows the changes in our allowance for doubtful accounts:
(in thousands)
 
2015
 
2014
 
2013
Balance at January 1
 
$
1,560

 
$
1,259

 
$
1,722

Write-offs
 
(558
)
 
(488
)
 
(342
)
Recoveries
 
236

 
139

 
116

Increase (decrease) in allowance
 
1,119

 
650

 
(237
)
Balance at December 31
 
$
2,357

 
$
1,560

 
$
1,259