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Borrowings and Lines of Credit Borrowings and Lines of Credit - Narrative (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Oct. 11, 2017
USD ($)
May 04, 2016
$ / shares
Feb. 09, 2016
USD ($)
Feb. 08, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 30, 2014
USD ($)
Jan. 27, 2014
USD ($)
Debt Instrument [Line Items]                    
Long-term debt $ 158,100,000 $ 192,600,000                
Long-term Debt, Current Maturities $ 0 $ 0                
Debt Instrument, Convertible, Conversion Ratio 54.2741                  
Debt Instrument, Convertible, Conversion Price | $ / shares $ 18.4250                  
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | $ / shares $ 0.02 $ 0.69 $ (0.70)              
Long-term debt $ 158,100,000 $ 192,600,000                
Net deferred tax asset $ 13,100,000 22,400,000                
Document Fiscal Year Focus 2018                  
Payments for Hedge, Financing Activities $ 0 0 $ 44,500,000              
Proceeds from issuance of warrants $ 0 0 39,100,000              
Revolving Credit Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity               $ 350,000,000.0 $ 200,000,000.0 $ 200,000,000.0
Line of Credit Facility, Additional Incremental Borrowing Capacity               100,000,000.0 250,000,000.0  
Letter of Credit | Line of Credit                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity               50,000,000.0 $ 25,000,000.0  
Bridge Loan | Line of Credit                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity               $ 35,000,000.0    
Convertible Notes Due Twenty Twenty One [Member] | Convertible Debt                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage 17250000000.00%                  
Debt instrument, face amount $ 172,500,000 172,500,000                
Debt instrument, convertible, carrying amount of equity component 29,900,000 29,900,000                
Debt Issuance Costs Attributable to the Equity Component 1,300,000                  
Interest Expense, Debt, Excluding Amortization 5,600,000 5,600,000 3,700,000              
Amortization of Debt Issuance Costs 900,000 900,000 600,000              
Amortization of Debt Discount (Premium) 6,300,000 5,800,000 3,600,000              
Debt Issuance Costs, Net 5,000,000.0                  
Net deferred tax asset 500,000                  
Debt Instrument, Unamortized Discount (23,400,000) (30,600,000)                
Convertible Notes Payable 149,100,000 141,900,000                
Convertible Notes Payable, Current 0 0                
Convertible Notes Payable, Noncurrent 149,100,000 141,900,000                
Debt Instrument, Fair Value Disclosure 178,200,000                  
Payments for Hedge, Financing Activities 44,500,000                  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares         $ 21.1050          
Proceeds from issuance of warrants 39,100,000                  
Interest Expense, Debt $ 12,800,000 12,300,000 $ 7,900,000              
Credit Facility Due October 11, 2022 [Member]                    
Debt Instrument [Line Items]                    
Debt covenant, EBITDA to interest ratio 3.25                  
Debt Instrument, Covenant, Debt to EBITDA, Maximum 3.75                  
Debt Instrument, Covenant, Senior Secured Leverage Ratio, Maximum 3.25                  
Line of credit facility, maximum borrowing capacity       $ 400,000,000.0            
Credit Facility Due October 11, 2022 [Member] | Line of Credit                    
Debt Instrument [Line Items]                    
Long-term Line of Credit $ 9,000,000.0                  
Credit Facility Due October 11, 2022 [Member] | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity       100,000,000.0            
Credit Facility Due October 11, 2022 [Member] | Revolving Credit Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Long-term debt 9,000,000.0 50,700,000                
Credit Facility Due October 11, 2022 [Member] | Letter of Credit                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity       50,000,000.0            
Term Loan and Revolving Credit Facility Due January 2019 [Member]                    
Debt Instrument [Line Items]                    
Long-term Debt, Current Maturities 0 0                
Long-term debt $ 9,000,000.0 50,700,000                
Term Loan and Revolving Credit Facility Due January 2019 [Member] | Line of Credit                    
Debt Instrument [Line Items]                    
Long-term Line of Credit   $ 50,700,000                
Senior Secured Note Issued January 2014 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                   $ 300,000,000.0
Credit Agreement Amendment February 2016 | Line of Credit                    
Debt Instrument [Line Items]                    
Long-term debt           $ 300,000,000.0        
Credit Agreement Amendment February 2016 | Revolving Credit Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity             $ 350,000,000.0      
London Interbank Offered Rate (LIBOR) | Credit Facilities                    
Debt Instrument [Line Items]                    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 3.56% 3.58% 3.23%              
Minimum | Credit Facility Due October 11, 2022 [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Commitment Fee Percentage 0.20%                  
Minimum | London Interbank Offered Rate (LIBOR) | Credit Facility Due October 11, 2022 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate 1.25%                  
Maximum | Credit Facility Due October 11, 2022 [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Commitment Fee Percentage 0.35%                  
Maximum | Credit Facility Due October 11, 2022 [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, accordion feature, increase limit       $ 200,000,000.0            
Maximum | London Interbank Offered Rate (LIBOR) | Credit Facility Due October 11, 2022 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate 2.25%                  
Weighted Average | Credit Facilities                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Commitment Fee Percentage 0.24% 0.36% 0.39%