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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% |  |  |  |  |  |  |

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