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Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2015
Payables and Accruals [Abstract]  
Summary of accrued liabilities
Accrued liabilities consisted of the following (in thousands):

 
December 31,
 
2015
 
2014
Accrued salaries and other benefits
$
27,066

 
$
39,182

Accrued income and other taxes
15,006

 
20,807

Accrued interest
12,675

 
14,286

Interest rate swaps fair value
4,608

 
4,958

Accrued other liabilities
20,698

 
11,949

Accrued liabilities
$
80,053

 
$
91,182