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Notes Payable (Details) - USD ($)
3 Months Ended
Feb. 14, 2017
Nov. 09, 2015
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Unamortized deferred financing costs     $ 5,700,000   $ 6,100,000
Amortization of financing costs     398,000 $ 398,000  
Notes Payable to Banks [Member]          
Debt Instrument [Line Items]          
Notes payable, net of deferred financing costs     $ 400,000,000   $ 400,000,000
Term Loan [Member] | Secured Debt [Member]          
Debt Instrument [Line Items]          
Weighted average interest rate     2.56%   2.36%
Revolving Credit Facility [Member] | Secured Debt [Member]          
Debt Instrument [Line Items]          
Weighted average interest rate     2.70%   2.46%
Fair value of amount outstanding     $ 45,000,000   $ 45,000,000
Revolving Credit and Term Loan [Member]          
Debt Instrument [Line Items]          
Tangible net worth requirement   $ 845,700,000.0      
Loan Agreement Amendment [Member] | Revolving Credit and Term Loan [Member]          
Debt Instrument [Line Items]          
Accordion feature, increase limit $ 50,000,000        
Tangible net worth requirement $ 868,900,000.0