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Total Debt - Narrative (Details)
12 Months Ended
Dec. 16, 2015
USD ($)
Dec. 01, 2014
USD ($)
Dec. 16, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]          
Loan origination fees   $ 900,000      
Debt weighted average interest rate       1.73% 2.19%
Notes payable       $ 593,670,000 $ 294,536,000
Debt interest rate 5.375%   5.375%    
Proceeds from Issuance of Unsecured Debt $ 299,000,000   $ 295,000,000    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed       104.031%  
Secured Debt          
Debt Instrument [Line Items]          
Term Loan Facility   $ 200,000,000   $ 188,800,000  
Annual paydown requirements year one       5.00%  
Annual paydown requirements year two       7.50%  
Annual paydown requirements year three       10.00%  
Annual paydown requirements year four       12.50%  
Annual paydown requirements year five       15.00%  
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Variable rate basis       LIBOR  
Remaining borrowing capacity       $ 492,100,000  
Unsecured Debt          
Debt Instrument [Line Items]          
Notes payable $ 300,000,000   300,000,000 600,000,000  
Premium Percent for Debt Issuance 101.00%        
Debt issuance costs $ 4,700,000   $ 6,300,000    
Quarterly Principal Payments | Secured Debt          
Debt Instrument [Line Items]          
Long-term Line of Credit, Noncurrent       2,400,000  
Incremental Quarterly Principal Payments | Secured Debt          
Debt Instrument [Line Items]          
Long-term Line of Credit, Noncurrent       1,200,000  
Maximum Quarterly Principal Payments | Secured Debt          
Debt Instrument [Line Items]          
Long-term Line of Credit, Noncurrent       7,100,000  
Final Balance Due | Secured Debt          
Debt Instrument [Line Items]          
Long-term Line of Credit, Noncurrent       $ 94,400,000  
Minimum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Margin on variable rate       1.125%  
Commitment fee, unused capacity       0.175%  
Debt covenant, interest coverage ratio       3.0  
Debt covenant, leverage ratio       4.5  
Maximum [Member] | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Margin on variable rate       3.00%  
Commitment fee, unused capacity       0.45%  
Debt covenant, leverage ratio       5.0  
Line of Credit Facility, Covenant Terms, Senior Secured Leverage Ratio       3.5  
5.375% Senior Unsecured Notes due 2021 | Unsecured Debt          
Debt Instrument [Line Items]          
Percent of principal amount of notes redeemed prior to make-whole premium       100.00%  
Debt interest rate       5.375% 5.375%