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Debt, Convertible Note (Details) |  |  |  | 3 Months Ended | 4 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 18, 2018 USD ($) | Feb. 28, 2018 shares | Jun. 16, 2016 USD ($) | Mar. 31, 2018 USD ($) d $ / shares shares | Mar. 31, 2017 USD ($) | Apr. 17, 2018 USD ($)
Convertible Debt [Abstract] |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ (7,220,000) | $ 0 |
Common Class A [Member] |  |  |  |  |  |
Convertible Debt [Abstract] |  |  |  |  |  |
Shares issued (in shares) | shares |  | 1,535,652 |  |  |  |
Convertible Note [Member] |  |  |  |  |  |
Convertible Debt [Abstract] |  |  |  |  |  |
Original principal amount |  |  | $ 210,000,000 | $ 210,000,000 |  |
Interest rate |  |  |  | 4.75% |  |
Redemption price, percentage of principal amount redeemed |  |  |  | 100.00% |  |
Threshold percentage of stock price trigger |  |  |  | 180.00% |  |
Threshold trading days | d |  |  |  | 20 |  |
Threshold final trading days | d |  |  |  | 3 |  |
Threshold consecutive trading days | d |  |  |  | 30 |  |
Principal amount increments that can be repurchased upon a change in control or termination of trading of common stock |  |  |  | $ 1,000 |  |
Principal amount increments that can be converted |  |  |  | $ 1,000 |  |
Holding period following issue date before notes can be converted |  |  |  | 6 months |  |
Initial conversion rate (in shares) | shares |  |  |  | 21.5054 |  |
Initial conversion price (in dollars per share) | $ / shares |  |  |  | $ 46.50 |  |
Proceeds from issuance of notes |  |  | 210,000,000 |  |  |
Liability component of convertible notes |  |  | 199,100,000 |  |  |
Equity component of convertible notes allocated to additional paid-in capital |  |  | $ 10,900,000 |  |  |
Effective interest rate |  |  |  | 7.10% |  |
Debt issuance costs |  |  |  | $ 6,600,000 |  |
Additions to deferred financing cost |  |  |  | 6,300,000 |  |
Adjustments to additional paid-in capital for debt issuance costs |  |  |  | 300,000 |  |
Interest expense |  |  |  | 3,000,000 |  |
Contractual interest |  |  |  | 2,500,000 |  |
Amortization of debt issuance costs and debt discount |  |  |  | $ 500,000 |  |
Convertible Note [Member] | Subsequent Event [Member] |  |  |  |  |  |
Convertible Debt [Abstract] |  |  |  |  |  |
Interest rate | 4.75% |  |  |  |  |
Payment for principal and accrued interest | $ 213,400,000 |  |  |  |  |
Accrued interest |  |  |  |  |  | $ 3,400,000

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- Definition Threshold number of specified final trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature. + References No definition available. + Details
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- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51819886&loc=SL6014347-161799 + Details
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