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Borrowings and Lines of Credit Borrowings and Lines of Credit - Narrative (Details) |  |  |  |  |  | 12 Months Ended |  |  |
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Apr. 27, 2016 | Apr. 26, 2016 | Feb. 09, 2016 USD ($) | Jul. 01, 2015 | Jan. 27, 2014 USD ($) | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | May 04, 2016 $ / shares | Feb. 08, 2016 USD ($) | Dec. 30, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Document Fiscal Year Focus |  |  |  |  |  | 2016 |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 298,200,000 | $ 428,800,000 |  |  |  |
Debt Instrument, Covenant, Leverage Ratio, Maximum |  | 3.25 |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  | 54.2741 |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  |  |  |  | $ 18.4250 |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 288,500,000 | 399,200,000 |  |  |  |
Payments for Hedge, Financing Activities |  |  |  |  |  | 44,500,000 | 0 | $ 0 |  |  |
Proceeds from Issuance of Warrants |  |  |  |  |  | $ 39,100,000 | 0 | 0 |  |  |
Credit Facilities |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt covenant, EBITDA to interest ratio |  |  |  |  |  | 3.25 |  |  |  |  |
Debt Instrument, Covenant, Debt to EBITDA, Maximum |  |  |  |  |  | 3.75 |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  |  |  |  | 5 years |  |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
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
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 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 17250000000.00% |  |  | 3.25% |  |
Senior secured term loan facility |  |  |  |  |  | $ 172,500,000 |  |  |  |  |
Long-term debt |  |  |  |  |  | 36,600,000 |  |  |  |  |
Debt instrument, convertible, carrying amount of equity component |  |  |  |  |  | 29,900,000 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | 5,000,000 |  |  |  |  |
Debt Issuance Costs Attributable to the Equity Component |  |  |  |  |  | 1,300,000 |  |  |  |  |
Deferred Tax Assets, Net |  |  |  |  |  | 500,000 |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  |  | 37,400,000 |  |  |  |  |
Convertible Notes Payable |  |  |  |  |  | 135,100,000 | $ 0 |  |  |  |
Convertible Notes Payable, Current |  |  |  |  |  | 900,000 |  |  |  |  |
Convertible Notes Payable, Noncurrent |  |  |  |  |  | 136,000,000 |  |  |  |  |
Debt Instrument, Fair Value Disclosure |  |  |  |  |  | 202,600,000 |  |  |  |  |
Payments for Hedge, Financing Activities |  |  |  |  |  | 44,500,000.00 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  | $ 21.1050 |  |
Proceeds from Issuance of Warrants |  |  |  |  |  | $ 39,100,000 |  |  |  |  |
Credit Agreement Amendment April 2016 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Senior Secured Leverage Ratio, Maximum | 3.25 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Leverage Ratio, Maximum | 3.75 |  |  |  |  |  |  |  |  |  |
Senior Secured Note Issued January 2014 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  |  |  | 5 years |  |  |  |  |  |
Senior secured term loan facility |  |  |  |  | $ 300,000,000 |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 300,000,000 |  |  |  |  |  |
Credit Facilities | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, consolidated EBITDA cap |  |  |  | 15.00% |  |  |  |  |  |  |
Credit Agreement Amendment February 2016 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 300,000,000 |  |  |  |  |  |  |  |
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 |
Debt instrument, covenant, consolidated EBITDA maximum adjustment |  |  | $ 45,000,000.0 |  |  |  |  |  |  |  |

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