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Debt - Senior Credit Facility Executed at the IPO (Details) - USD ($)
Jul. 31, 2015
Jul. 08, 2015
Jul. 31, 2013
Dec. 17, 2012
Dec. 31, 2015
Dec. 31, 2014
Aug. 01, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 24, 2011
May. 30, 2008
Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Past maturity, extension period   1 year                  
Adjusted tangible net worth threshold (greater than)   $ 18,000,000.0                  
Minimum fixed charge coverage ratio   110.00%                  
Minimum fixed charge coverage ratio, increase to numerator increment   5.00%                  
Maximum leverage ratio   250.00%                  
Debt default, change in control, ownership percentage (less than)   40.00%                  
Debt default, material judgment (in excess of)   $ 5,000,000.0                  
Senior Credit Facility                      
Line of Credit Facility [Line Items]                      
Letters of credit issued and outstanding         $ 21,500,000 $ 10,700,000          
Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Line of credit facility, maximum borrowing capacity       $ 30,000,000             $ 35,000,000
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Maximum                      
Line of Credit Facility [Line Items]                      
Commitment fee percentage   0.50%                  
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Minimum                      
Line of Credit Facility [Line Items]                      
Commitment fee percentage   0.375%                  
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Eurodollar | Maximum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   3.00%                  
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Base Rate | Maximum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   2.00%                  
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Cost of Funds Rate | Maximum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   2.50%                  
Revolving Credit Facility | Working Capital Line                      
Line of Credit Facility [Line Items]                      
Line of credit facility, maximum borrowing capacity   $ 60,000,000.0                  
Minimum consolidated net working capital   2,000,000.0                  
Working capital, maximum increase   $ 5,000,000.0                  
Working capital, percentage of borrowing capacity   15.00%                  
Adjusted tangible net worth, aggregate commitments percentage   20.00%                  
Revolving Credit Facility | Working Capital Line | Maximum                      
Line of Credit Facility [Line Items]                      
Line of credit, availability   $ 60,000,000.0                  
Borrowing base calculated on value of eligible accounts receivable, unbilled product sales, inventory and other working capital assets, percentage   90.00%                  
Revolving Credit Facility | Working Capital Line | Minimum                      
Line of Credit Facility [Line Items]                      
Line of credit, availability   $ 30,000,000.0                  
Borrowing base calculated on value of eligible accounts receivable, unbilled product sales, inventory and other working capital assets, percentage   80.00%                  
Revolving Credit Facility | Working Capital Line | Federal Funds Rate                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   0.50%                  
Revolving Credit Facility | Working Capital Line | Reference Eurodollar Rate                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   1.00%                  
Revolving Credit Facility | Working Capital Line | CenStar                      
Line of Credit Facility [Line Items]                      
Borrowings   $ 10,400,000                  
Revolving Credit Facility | Acquisition Line                      
Line of Credit Facility [Line Items]                      
Line of credit facility, maximum borrowing capacity   $ 25,000,000.0                  
Financing of cost of acquisitions, maximum percentage   75.00%                  
Annual payment percentage   25.00%                  
Remaining payment due at maturity, percentage   50.00%                  
Nonutilization fee   0.50%                  
Adjusted tangible net worth, borrowings percentage   33.00%                  
Revolving Credit Facility | Acquisition Line | Eurodollar                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   3.75%                  
Revolving Credit Facility | Acquisition Line | Base Rate                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   2.75%                  
Revolving Credit Facility | Acquisition Line | Federal Funds Rate                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   0.50%                  
Revolving Credit Facility | Acquisition Line | Reference Eurodollar Rate                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   1.00%                  
Revolving Credit Facility | Acquisition Line | CenStar                      
Line of Credit Facility [Line Items]                      
Borrowings   $ 6,200,000                  
Revolving Credit Facility | Acquisition Line | Oasis                      
Line of Credit Facility [Line Items]                      
Borrowings $ 15,000,000                    
Revolving Credit Facility | Senior Credit Facility | Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Line of credit facility, maximum borrowing capacity             $ 70,000,000.0        
Contingent maximum borrowing capacity             120,000,000.0        
Line of credit facility, outstanding             10,000,000        
Reduction to interest rate if facility utilization is less than fifty percent   0.25%                  
Working Capital Facility                      
Line of Credit Facility [Line Items]                      
Line of credit facility, maximum borrowing capacity     $ 80,000,000 $ 70,000,000         $ 150,000,000 $ 150,000,000 $ 177,500,000.0
Working capital credit facility outstanding portion paid by affiliate               $ 29,000,000      
Commitment fee percentage     0.50%                
Nonutilization fee       0.50%              
Working Capital Facility | Eurodollar | Maximum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate     3.25% 3.75%              
Working Capital Facility | Eurodollar | Minimum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate     3.00% 3.00%              
Working Capital Facility | Base Rate | Maximum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate     2.25% 2.75%              
Working Capital Facility | Base Rate | Minimum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate     2.00% 2.00%              
Working Capital Facility | Cost of Funds Rate | Maximum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate     2.75%                
Working Capital Facility | Cost of Funds Rate | Minimum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate     2.50%                
Working Capital Facility | Senior Credit Facility                      
Line of Credit Facility [Line Items]                      
Working capital credit facility outstanding portion paid by affiliate             29,000,000        
Letters of credit issued and outstanding             $ 15,000,000