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Senior Notes, Secured, and Unsecured Indebtedness - Revolving Line of Credit - Narrative (Details) - USD ($)
6 Months Ended
Jul. 01, 2016
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Mar. 27, 2015
Mar. 31, 2014
Debt Instrument [Line Items]                
Notes payable         $ 259,342,000 $ 175,181,000    
5 3/4% Senior Notes due April 15, 2019                
Debt Instrument [Line Items]                
Stated interest rate         5.75% 5.75%    
Revolving Credit Facility                
Debt Instrument [Line Items]                
Effective rate         4.37% 3.32%    
Revolving Credit Facility | Amended Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 130,000,000.0         $ 130,000,000.0  
Additional capacity under accordion feature             200,000,000.0  
Commitment fee percentage   50.00%            
Revolving Credit Facility | Second Amended Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 145,000,000.0              
Additional capacity under accordion feature $ 200,000,000.0              
Debt Instrument, Covenant, Tangible Net Worth, Minimum         $ 451,000,000.0      
Debt instrument, subjective acceleration clause, percentage of EBITDA, minimum 50.00%              
Debt Instrument, Covenant, Leverage Ratio, Maximum         65.00%      
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum         1.50      
Debt Instrument, Covenant, Interest Coverage Ratio, Maximum Liquidity Used in Calculation         $ 50,000,000.0      
Revolving Credit Facility | Original Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity             100,000,000  
Additional capacity under accordion feature             125,000,000.0  
Letter of Credit                
Debt Instrument [Line Items]                
Outstanding letter of credit         $ 8,600,000      
Letter of Credit | Amended Facility                
Debt Instrument [Line Items]                
Minimum borrowing capacity             $ 50,000,000.0  
Outstanding letter of credit           $ 8,600,000    
Letter of Credit | Second Amended Facility                
Debt Instrument [Line Items]                
Minimum borrowing capacity $ 50,000,000.0              
Senior Notes | 5 3/4% Senior Notes due April 15, 2019                
Debt Instrument [Line Items]                
Stated interest rate         5.75% 5.75%   5.75%
Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Notes payable         $ 96,000,000 $ 65,000,000    
Scenario, Forecast | Revolving Credit Facility | Second Amended Facility                
Debt Instrument [Line Items]                
Debt Instrument, Covenant, Leverage Ratio, Maximum     60.00% 62.50%