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Borrowings and Lines of Credit - Schedule of Long-term Debt Instruments (Details)
 12 Months Ended
Jan. 27, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
May 04, 2016
Dec. 31, 2014
USD ($)
Dec. 30, 2014
USD ($)
Long-term borrowings [Abstract]            
Long-term debt   $ 298,200,000 $ 428,800,000      
Less: current maturities   9,700,000 29,600,000      
Long-term debt (noncurrent)   288,500,000 399,200,000      
Term Loan Due January 2019 [Member]            
Long-term borrowings [Abstract]            
Debt Issuance Costs, Net   (400,000) (1,200,000)      
Term Loan and Revolving Credit Facility Due January 2019 [Member]            
Long-term borrowings [Abstract]            
Long-term debt   163,100,000 428,800,000      
Less: current maturities   10,600,000 29,600,000      
Long-term debt (noncurrent)   $ 152,500,000 399,200,000      
Convertible Debt [Member] | Convertible Notes Due Twenty Twenty One [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage   17250000000.00%   3.25%    
Interest Expense, Debt, Excluding Amortization   $ 3,700,000        
Convertible Notes Payable   135,100,000 $ 0      
Long-term borrowings [Abstract]            
Long-term debt (noncurrent)   36,600,000        
Senior secured term loan facility   172,500,000        
Amortization of Debt Issuance Costs   600,000        
Amortization of Debt Discount (Premium)   3,600,000        
Interest Expense, Debt   7,900,000        
Debt Issuance Costs, Net   (5,000,000)        
Convertible Notes Payable, Current   $ 900,000        
Credit Facilities            
Long-term borrowings [Abstract]            
Debt covenant, EBITDA to interest ratio   3.25        
Debt Instrument, Covenant, Debt to EBITDA, Maximum   3.75        
Credit Facilities | Minimum            
Long-term borrowings [Abstract]            
Commitment fee percentage   0.20%        
Credit Facilities | Maximum            
Long-term borrowings [Abstract]            
Commitment fee percentage   0.40%        
Credit Facilities | Weighted Average            
Long-term borrowings [Abstract]            
Commitment fee percentage   0.39% 0.38%      
Credit Facilities | LIBOR            
Long-term borrowings [Abstract]            
Weighted average interest rate at period end   3.23% 2.32%      
Credit Facilities | LIBOR | Minimum            
Long-term borrowings [Abstract]            
Basis spread on variable rate   1.25%        
Credit Facilities | LIBOR | Maximum            
Long-term borrowings [Abstract]            
Basis spread on variable rate   2.25%        
Line of Credit | Revolving Credit Facility            
Long-term borrowings [Abstract]            
Line of credit facility, maximum borrowing capacity $ 200,000,000 $ 300,000,000     $ 350,000,000 $ 200,000,000
Debt term 5 years 5 years        
Line of credit facility, amount outstanding         100,000,000  
Line of Credit Facility, Additional Incremental Borrowing Capacity         100,000,000.0 250,000,000.0
Line of Credit | Revolving Credit Facility | Revolving Credit Facility due January 2019 [Member]            
Long-term borrowings [Abstract]            
Long-term debt   $ 45,000,000 $ 145,000,000      
Line of Credit | Letter of Credit            
Long-term borrowings [Abstract]            
Line of credit facility, maximum borrowing capacity         50,000,000.0 $ 25,000,000.0
Line of Credit | Bridge Loan            
Long-term borrowings [Abstract]            
Line of credit facility, maximum borrowing capacity         $ 35,000,000.0  
Senior Notes            
Long-term borrowings [Abstract]            
Debt term   5 years        
Senior Notes | Term Loan Due January 2019 [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year   $ 10,800,000        
Long-term borrowings [Abstract]            
Long-term debt   118,500,000 $ 285,000,000      
2016   14,400,000        
2017   138,300,000        
2018   0        
2019   $ 172,500,000        
Senior Notes | Senior Secured Note Issued January 2014            
Long-term borrowings [Abstract]            
Long-term debt $ 300,000,000          
Debt term 5 years          
Senior secured term loan facility $ 300,000,000