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Debt, Commitments and Contingencies - Debt (Details)
12 Months Ended
Mar. 08, 2017
USD ($)
business_unit
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 10, 2016
USD ($)
Subsequent Event | Connect And Piper          
Debt Instrument [Line Items]          
Number of business units acquired | business_unit 2        
Total consideration $ 148,500,000        
Cash paid to acquire business 81,500,000        
Amounts drawn under senior line of credit $ 67,000,000        
Line of Credit | 2014 Facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Current borrowing capacity       $ 50,000,000.0 $ 75,000,000.0
Long-term debt   $ 6,700,000 $ 6,700,000    
Maximum borrowing capacity         $ 125,000,000.0
Consolidated leverage ratio covenant (not to exceed)       2.50 3.00
Effective interest rate (percent)   2.82% 2.63% 2.62%  
Consolidated fixed charge coverage ratio covenant (at least)   1.25      
Line of Credit | 2014 Facility | Revolving Credit Facility | Minimum          
Debt Instrument [Line Items]          
Unused line commitment fee (percent)       0.20%  
Line of Credit | 2014 Facility | Revolving Credit Facility | Maximum          
Debt Instrument [Line Items]          
Unused line commitment fee (percent)       0.25%  
Line of Credit | 2014 Facility | Revolving Credit Facility | Federal Funds rate          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)   0.50%      
Line of Credit | 2014 Facility | Revolving Credit Facility | LIBOR | Leverage Ratio (less than or equal to)          
Debt Instrument [Line Items]          
Consolidated leverage ratio   1.00      
Line of Credit | 2014 Facility | Revolving Credit Facility | LIBOR | Leverage Ratio (greater than or equal to, but less than) | Minimum          
Debt Instrument [Line Items]          
Consolidated leverage ratio   1.00      
Line of Credit | 2014 Facility | Revolving Credit Facility | LIBOR | Leverage Ratio (greater than or equal to, but less than) | Maximum          
Debt Instrument [Line Items]          
Consolidated leverage ratio   2.00      
Line of Credit | 2014 Facility | Revolving Credit Facility | LIBOR | Leverage Ratio (less than)          
Debt Instrument [Line Items]          
Consolidated leverage ratio   2.00      
Line of Credit | 2014 Facility | Revolving Credit Facility | Noncurrent Liabilities          
Debt Instrument [Line Items]          
Long-term debt       $ 6,700,000  
Line of Credit | 2014 Facility | Revolving Credit Facility | Consolidated Leverage Ratio, Less Than 1.00 | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)     2.25% 2.25%  
Unused line commitment fee (percent)   2.00%      
Line of Credit | 2014 Facility | Revolving Credit Facility | Consolidated Leverage Ratio, Greater Than Or Equal To 1.00 But Less Than 2.00 | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)   2.25% 2.50% 2.50%  
Line of Credit | 2014 Facility | Revolving Credit Facility | Consolidated Leverage Ratio, Greater Than Or Equal To 2.00 | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)   2.50% 2.75% 2.75%