Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Notes Narrative (Details)

v3.10.0.1
Long-Term Debt - Notes Narrative (Details)
6 Months Ended
Mar. 10, 2017
USD ($)
Sep. 30, 2016
USD ($)
May 09, 2013
USD ($)
Jun. 30, 2018
USD ($)
Location
$ / shares
Mortgage notes        
Debt Instrument [Line Items]        
Mortgage financing aggregate       $ 21,100,000
Number of operating locations related to mortgage financing | Location       3
Debt weighted average interest rate on note       4.53%
Outstanding principal balance       $ 422,600,000
5.0% Notes        
Debt Instrument [Line Items]        
Stated interest rate on debt agreement     5.00% 5.00%
Principal amount     $ 300,000,000  
Notes issued, percent of principal     100.00%  
Outstanding notes repurchased amount   $ 10,700,000    
Repurchase amount paid in cash, plus accrued and unpaid interest related thereto   $ 10,600,000    
Maximum dividend (usd per share) | $ / shares       $ 0.10
6.125% Notes        
Debt Instrument [Line Items]        
Stated interest rate on debt agreement 6.125%     6.125%
Principal amount $ 250,000,000      
Notes issued, percent of principal 100.00%      
Maximum dividend (usd per share) | $ / shares       $ 0.12
7.0% Senior Subordinate Notes        
Debt Instrument [Line Items]        
Stated interest rate on debt agreement       7.00%