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Indebtedness - Narrative (Details)
1 Months Ended 2 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 18, 2017
USD ($)
Apr. 14, 2014
USD ($)
Jan. 31, 2018
Dec. 31, 2002
USD ($)
Property
Nov. 30, 2004
USD ($)
Property
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 17, 2017
USD ($)
Apr. 13, 2014
Jul. 05, 2011
USD ($)
Debt Instruments [Abstract]                        
Debt             $ 368,798,000 $ 497,829,000        
Less: Current Maturities             97,192,000 146,515,000        
Long-Term Debt             271,606,000 351,314,000        
Unamortized debt issuance expense             1,500,000          
Repayments of Long-term Lines of Credit             162,910,000 208,607,000 $ 330,747,000      
Interest expense             $ 20,538,000 23,390,000 $ 23,339,000      
Lease term (in years)             15 years          
Sale leaseback transaction, deferred gain, net             $ 0          
DAMI Credit Facility | LIBOR | Revolving Credit Agreement                        
Debt Instruments [Abstract]                        
Interest rate basis spread (percentage)             2.82%          
Revolving Facility                        
Debt Instruments [Abstract]                        
Debt covenant, EBITDA plus lease expense to fixed charges (no less than)             2          
Debt covenant, total debt to EBITDA (no greater than)             3          
Line of Credit                        
Debt Instruments [Abstract]                        
Debt issuance costs, gross   $ 3,000,000                    
Interest expense             $ 200,000          
Line of Credit | Revolving Credit Agreement                        
Debt Instruments [Abstract]                        
Debt issuance costs, net             3,200,000          
Maximum borrowing capacity   400,000,000                    
Line of Credit | Letter of Credit                        
Debt Instruments [Abstract]                        
Maximum borrowing capacity   $ 35,000,000               $ 20,000,000    
Line of Credit | LIBOR | Minimum                        
Debt Instruments [Abstract]                        
Interest rate basis spread (percentage)   1.25%                    
Line of Credit | LIBOR | Maximum                        
Debt Instruments [Abstract]                        
Interest rate basis spread (percentage)   2.25%                    
Line of Credit | Prime Rate | Minimum                        
Debt Instruments [Abstract]                        
Interest rate basis spread (percentage)   0.25%                    
Line of Credit | Base Rate | Maximum                        
Debt Instruments [Abstract]                        
Interest rate basis spread (percentage)   1.25%                    
Line of Credit | DAMI Credit Facility | Revolving Credit Agreement                        
Debt Instruments [Abstract]                        
Debt             0 47,302,000        
Debt issuance costs, net             1,700,000          
Repayments of Long-term Lines of Credit $ 53,000,000                      
Line of Credit | Revolving Facility | Revolving Credit Agreement                        
Debt Instruments [Abstract]                        
Debt             0 0        
Line of credit, current borrowing capacity (up to)               225,000,000        
Line of credit, additional borrowing capacity (up to)             250,000,000          
Decrease in credit amount outstanding             6,100,000          
Line of credit amount outstanding             $ 393,900,000          
Line of Credit | Revolving Facility | Revolving Credit Agreement | Minimum                        
Debt Instruments [Abstract]                        
Commitment fee for unused balance amount (percentage)             0.15%          
Line of Credit | Revolving Facility | Revolving Credit Agreement | Maximum                        
Debt Instruments [Abstract]                        
Commitment fee for unused balance amount (percentage)             0.30%          
Unsecured Debt | Term Loan                        
Debt Instruments [Abstract]                        
Debt                   $ 84,400,000    
Maximum borrowing capacity   $ 100,000,000           125,000,000        
Incremental increase to borrowing capacity   15,600,000                    
Installment payments required   $ 2,500,000                    
Senior Unsecured Notes Issued July 2011                        
Debt Instruments [Abstract]                        
Notes issued                       $ 125,000,000
Debt interest rate (percentage)     3.95%               3.75%  
Annual principal repayment amount                       $ 25,000,000
Senior Notes | Senior Unsecured Notes, 3.95%, Due in Installments through April 2018                        
Debt Instruments [Abstract]                        
Debt             $ 24,994,000 49,975,000        
Senior Notes | Senior Unsecured Notes, 4.75%, Due in Installments through April 2021                        
Debt Instruments [Abstract]                        
Debt             239,784,000 299,562,000        
Notes issued     $ 300,000,000.0                  
Debt interest rate (percentage)     4.75%                  
Periodic payment, principal     $ 60,000,000.0                  
Term Loan                        
Debt Instruments [Abstract]                        
Debt             96,272,000 94,626,000        
Related Party                        
Debt Instruments [Abstract]                        
Properties sold | Property         10 11            
Borrowings collateralized by the land and buildings         $ 5,000,000 $ 6,800,000            
Lease term (in years)           15 years            
Aggregate annual rental         $ 800,000 $ 800,000            
Interest implicit in the leases (percentage)           9.70%            
Capital Lease Obligations, Related Party                        
Debt Instruments [Abstract]                        
Debt             1,314,000 3,095,000        
Capital Lease Obligations                        
Debt Instruments [Abstract]                        
Debt             $ 6,434,000 $ 3,269,000        
Subsequent Event | Related Party                        
Debt Instruments [Abstract]                        
Lease term (in years)       5 years                
Subsequent Event | Related Party | Minimum                        
Debt Instruments [Abstract]                        
Lease term (in years)       5 years                
Subsequent Event | Related Party | Maximum                        
Debt Instruments [Abstract]                        
Lease term (in years)       8 years