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Debt and Capital Lease Obligations (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
quarter
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
instrument
Dec. 31, 2011
series
Debt Instrument [Line Items]        
Debt Instrument, Number of Series of Debt Issued | series       2
Long-term Debt, Percentage Bearing Fixed Interest, Amount $ 200,000      
Debt Instrument, Maturity Date Aug. 29, 2019      
Long-term Debt $ (218,000) $ (435,244)    
Long-term Debt, Excluding Current Maturities 216,488 430,987    
Cash payments for interest 11,248 12,313 $ 10,272  
Line of Credit Facility, Current Borrowing Capacity 400,000   $ 350,000  
Uncommitted borrowings available 50,000      
Line of Credit Facility, Maximum Borrowing Capacity 450,000      
Performance bonds under credit facility 25,800      
Line of Credit Facility, Remaining Borrowing Capacity 306,200      
Performance Bonds 15,000      
Long-term Debt, Percentage Bearing Variable Interest, Amount 18,000      
Interest Rate Swap [Member]        
Debt Instrument [Line Items]        
Derivative, Number of Instruments Held | instrument     2  
Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount 150,000      
Long-term Debt (150,000) (150,000)    
Line of Credit [Member]        
Debt Instrument [Line Items]        
Long-term Debt $ (68,000) (283,000)    
Debt Instrument, Covenant, Number of Quarters Used for Measurement of Covenants | quarter 4      
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum 3.0      
Debt Instrument, Covenant, Leverage Ratio, Minimum 2.5      
Other Long-Term Debt [Member]        
Debt Instrument [Line Items]        
Long-term Debt $ 0 (2,244)    
Short-term Debt [Member]        
Debt Instrument [Line Items]        
Long-term Debt 0 (2,244)    
Debt issuance costs [Domain]        
Debt Instrument [Line Items]        
Long-term Debt (1,512) $ (2,013)    
senior notes series a [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 75,000      
Debt Instrument, Maturity Date Sep. 30, 2021      
Debt Instrument, Interest Rate, Effective Percentage 4.01%      
Senior Notes Series B [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 75,000      
Debt Instrument, Maturity Date Sep. 30, 2023      
Debt Instrument, Interest Rate, Effective Percentage 4.11%      
Minimum [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.25% 1.25%    
Maximum [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 2.00%