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Long-Term Debt (Narrative) (Details)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Jan. 06, 2016
USD ($)
Jan. 02, 2016
USD ($)
Jun. 09, 2015
USD ($)
Debt Instrument [Line Items]          
Variable rate long-term debt $ 214,000,000     $ 40,000,000  
Long-term debt, carrying value $ 214,017,000     190,477,000  
Interest coverage ratio 4        
Consolidated leverage ratio 3.5        
Derivative fixed rate   1.29%      
Fair value of interest rate swap net asset $ 2,300,000        
Interest rate swap, net of tax 1,500,000        
Hedging Instrument | Interest rate swap          
Debt Instrument [Line Items]          
Derivative notional amount   $ 150,000,000      
Revolving commitment          
Debt Instrument [Line Items]          
Maximum line of credit facility borrowing capacity     $ 400,000,000   $ 250,000,000
Accordion feature     $ 150,000,000    
Outstanding revolving credit facility 214,000,000        
Long-term revolving credit facility 180,000,000        
Current revolving credit facility 34,000,000        
Fixed rate, long-term debt obligation          
Debt Instrument [Line Items]          
Long-term debt, carrying value $ 0     150,000,000  
Fixed rate, long-term debt obligation | Level 2          
Debt Instrument [Line Items]          
Long-term debt, fair value       $ 148,000,000