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Common Stock and Warrants (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 11, 2017 | Mar. 18, 2015 | Jul. 31, 2015 | Jan. 31, 2014 | Nov. 30, 2016 | Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Increase to shareholder's equity |  |  |  |  |  |  | $ 253,080 |
Loss on extinguishment of debt |  |  |  |  |  | $ 6,239 | 13,901 | $ 0
Public offering of common stock (in shares) |  |  | 28,750,000 |  |  |  |  |
Share price (in dollars per share) |  |  | $ 5.40 |  |  |  |  |
Net proceeds from public offering |  |  | $ 145,600 |  |  | $ 0 | 0 | $ 145,649
2014 Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Warrant period |  | 2 years |  | 2 years |  |  |  |
Warrants outstanding (in shares) | 0 |  |  | 1,000,000 |  |  |  |
Exercise price per share (in dollars per share) |  | $ 3.445 |  | $ 9.70 |  |  |  |
Fair Value of warrants |  | $ 1,500 |  |  |  |  |  |
Issuance of common stock on warrant exercise (in shares) | 877,451 |  |  |  |  |  |  |
Shares withheld for exercise of warrants (in shares) | 122,549 |  |  |  |  |  |  |
Over-allotment option [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Public offering of common stock (in shares) |  |  | 3,750,000 |  |  |  |  |
Senior subordinated notes [Member] | 2019 Notes [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Number of shares issued pursuant to conversion (in shares) |  |  |  |  | 54,009,279 |  |  |
Aggregate principal amount of debt converted |  |  |  |  | $ 286,900 |  |  |
Increase to shareholder's equity |  |  |  |  | 592,700 |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 13,900 |  | $ 13,901 |

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