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v3.19.1

Financial Commitments (Narrative) (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) d / item $ / shares shares | May 07, 2019 | Dec. 31, 2018 USD ($)
Senior Notes [Member] | Private Placement [Member] | 2017 Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 500,000,000 |  |
Interest rate | 6.875% |  |
Redemption price, change of control triggering event (as a percent) | 101.00% |  |
Senior Notes [Member] | Circumstance One [Member] | Private Placement [Member] | 2017 Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price | 100.00% |  |
Senior Notes [Member] | Circumstance Two [Member] | Private Placement [Member] | 2017 Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price | 106.875% |  |
Percentage of notes that can be redeemed | 40.00% |  |
Convertible Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 200,000,000 |  |
Interest rate | 2.875% |  |
Maturity date | Jun. 15, 2021 |  |
Conversion price | $ / shares | $ 30.25 |  |
Convertible Notes [Member] | Circumstance One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Business day period after consecutive trading day period | 5 days |  |
Consecutive trading day period | d / item | 10 |  |
Conversion price, principal amount | $ 1,000 |  |
Percentage of conversion price | 98.00% |  |
Convertible Notes [Member] | Circumstance Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Consecutive trading day period | d / item | 30 |  |
Percentage of conversion price | 130.00% |  |
Business day period within consecutive trading day period | d / item | 20 |  |
Conversion stock price trigger | $ / shares | $ 39.32 |  |
Conversion price, shares | shares | 33.0579 |  |
Minimum [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Consolidated leverage ratio | 3.25 |  |
Maximum [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Consolidated leverage ratio |  |  | 3.50
Credit Facility [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 350,000,000 |  |
Available borrowing capacity | 169,000,000 |  |
Additional borrowing | $ 150,000,000 |  |
Line of Credit Facility, Expiration Date | Apr. 20, 2022 |  |
Applicable margin and letter of credit fees will be increased percentage per annum. | 2.00% |  |
Weighted-average annual interest rate on borrowings | 5.28% |  |
Fixed charge coverage ratio | 1.25 |  |
Debt issuance costs | $ 4,400,000 |  | $ 4,800,000
Credit Facility [Member] | Letters Of Credit [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 150,000,000 |  |
Credit Facility [Member] | Swingline Loans [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 10,000,000 |  |
Credit Facility [Member] | Minimum [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Consolidated leverage ratio | 3.25 |  |
Credit Facility [Member] | Maximum [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Consolidated leverage ratio | 4.00 |  |
LIBOR [Member] | Credit Facility [Member] | Minimum [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate (as a percent)) | 1.50% |  |
LIBOR [Member] | Credit Facility [Member] | Maximum [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate (as a percent)) | 3.00% |  |
Base Rate [Member] | Credit Facility [Member] | Circumstance Three [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate (as a percent)) | 1.00% |  |
Base Rate [Member] | Credit Facility [Member] | Circumstance Four [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 0.00% |  |
Base Rate [Member] | Credit Facility [Member] | Minimum [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate (as a percent)) | 0.50% |  |
Base Rate [Member] | Credit Facility [Member] | Maximum [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate (as a percent)) | 2.00% |  |
Federal Funds Rate [Member] | Credit Facility [Member] | Circumstance Two [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate (as a percent)) | 0.50% |  |
Subsequent Event [Member] | Credit Facility [Member] | Maximum [Member] | Amendment To 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Consolidated leverage ratio |  | 3.50 |

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