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Debt (Narrative) (Details)
1 Months Ended 12 Months Ended
Aug. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Tranche
Dec. 31, 2009
USD ($)
Jul. 31, 2016
Feb. 29, 2016
USD ($)
Dec. 31, 2015
USD ($)
Aug. 12, 2014
USD ($)
Line of Credit Facility [Line Items]                
Number of Tranches Included in Term Loan | Tranche     9          
Long term debt maturity     $ 14,250,000          
Long-term Debt, Maturities, Repayments of Principal in Year Five     40,000,000          
Long-term Debt, Maturities, Repayments of Principal in Year Four     46,000,000          
Long-term Debt, Gross [1]     586,756,000       $ 606,337,000  
Amount Available to Increase Borrowing Capacity               $ 250,000,000
Revolving line of credit borrowings     0       30,000,000  
Remaining Borrowing Capacity     $ 248,800,000          
Line of Credit [Member]                
Line of Credit Facility [Line Items]                
Maximum Borrowing Capacity               250,000,000
Additional Applicable Rate Added to Base Rate, Minimum     1.50%          
Additional Applicable Rate Added to Base Rate, At End of Period     0.50%          
Unused Capacity, Commitment Fee Percentage     0.25%          
Letter of Credit [Member]                
Line of Credit Facility [Line Items]                
Maximum Borrowing Capacity               40,000,000
Line of Credit Facility, Amount Outstanding     $ 1,200,000          
Swing Line Loan [Member]                
Line of Credit Facility [Line Items]                
Maximum Borrowing Capacity               $ 25,000,000
Revenue Bonds [Member]                
Line of Credit Facility [Line Items]                
Interest Rate 2.75% 5.90%     6.00%      
Long-term Debt, Gross $ 65,700 $ 42,600,000            
Debt instrument maturity year 2024 2026            
Term Loan, Tranche One [Member]                
Line of Credit Facility [Line Items]                
Number of Tranches Included in Term Loan | Tranche     2          
Term Loan, Tranche Five [Member]                
Line of Credit Facility [Line Items]                
Number of Tranches Included in Term Loan | Tranche     1          
Long Term Debt, Maturities, Repayment of Principal in Year Ten     $ 27,500,000          
LIBOR [Member] | Term Loan, Tranche Five [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     2.15%          
London Interbank Offered Rate (LIBOR) [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Basis Spread on Variable Rate     1.00%          
Federal Fund Rate [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Basis Spread on Variable Rate     0.50%          
Eurodollar [Member] | Minimum [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Basis Spread on Variable Rate     0.875%          
Eurodollar [Member] | Maximum [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Basis Spread on Variable Rate     1.70%          
Base Rate [Member] | Minimum [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Basis Spread on Variable Rate     0.00%          
Base Rate [Member] | Maximum [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Basis Spread on Variable Rate     0.70%          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     2.15%          
Long-term Debt, Gross     $ 349,500,000     $ 27,500,000 $ 322,000,000  
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Minimum [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     2.50%       2.50%  
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Maximum [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     3.00%       3.00%  
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Debt Instrument, Redemption, Period One [Member] | Minimum [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     2.95%       2.95%  
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Debt Instrument, Redemption, Period One [Member] | Maximum [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     4.64%       4.64%  
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Term Loan, Tranche One [Member]                
Line of Credit Facility [Line Items]                
Long term debt maturity     $ 6,000,000          
Long-term Debt, Maturities, Repayments of Principal in Year Five     $ 6,000,000          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Term Loan, Tranche One [Member] | Debt Instrument, Redemption, Period One [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     2.95%          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Term Loan, Tranche One [Member] | Debt Instrument, Redemption, Period Two [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     3.70%          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Term Loan, Tranche Two [Member]                
Line of Credit Facility [Line Items]                
Number of Tranches Included in Term Loan | Tranche     3          
Long-term Debt, Maturities, Repayments of Principal in Year Five     $ 40,000,000          
Long-term Debt, Maturities, Repayments of Principal in Year Four     40,000,000          
Long Term Debt, Maturities, Repayment of Principal in Year Six     $ 40,000,000          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Term Loan, Tranche Three [Member]                
Line of Credit Facility [Line Items]                
Number of Tranches Included in Term Loan | Tranche     2          
Long Term Debt, Maturities, Repayment of Principal in Year Seven     $ 40,000,000          
Long Term Debt, Maturities, Repayment of Principal in Year Eight     $ 40,000,000          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Term Loan, Tranche Three [Member] | Debt Instrument, Redemption, Period One [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     4.29%          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Term Loan, Tranche Three [Member] | Debt Instrument, Redemption, Period Two [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     4.49%          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Term Loan, Tranche Four [Member]                
Line of Credit Facility [Line Items]                
Number of Tranches Included in Term Loan | Tranche     1          
Long Term Debt, Maturities, Repayment of Principal in Year Nine     $ 110,000,000          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | Term Loan, Tranche Four [Member] | Debt Instrument, Redemption, Period One [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     4.64%          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | LIBOR [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Basis Spread on Variable Rate     0.85%          
Debt instrument maturity year     2026          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | LIBOR [Member] | Term Loan, Tranche Two [Member] | Minimum [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Basis Spread on Variable Rate     1.65%          
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member] | LIBOR [Member] | Term Loan, Tranche Two [Member] | Maximum [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Basis Spread on Variable Rate     1.90%          
Senior notes, 7.50%, due 2019 [Member]                
Line of Credit Facility [Line Items]                
Interest Rate     7.50% 7.50%     7.50%  
Long-term Debt, Gross     $ 149,271,000       $ 149,013,000  
Debt instrument maturity year     2019          
Proceeds from Issuance of Debt       $ 150,000,000        
[1] The carrying amount of long-term debt includes principal and unamortized discounts.