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Financial Commitments (Narrative) (Details) |  | 6 Months Ended |
--- | --- | --- | ---
Apr. 20, 2017 USD ($) | Jun. 30, 2018 USD ($) d / item $ / shares shares | Dec. 31, 2017 USD ($)
Senior Notes [Member] | 2017 Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Effective interest rates |  | 7.13% |
Senior Notes [Member] | 2010 Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 300,000,000 |  |
Interest rate | 7.625% |  |
Maturity date | Nov. 01, 2018 |  |
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 |
Effective interest rates |  | 9.39% |
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 |
Credit Facility [Member] | 2017 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  | $ 350,000,000 |
Available borrowing capacity |  | 258,000,000 |
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 |  | 4.55% |
Fixed charge coverage ratio |  | 1.25 |
Debt issuance costs |  | $ 5,500,000 | $ 6,200,000
Credit Facility [Member] | 2014 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 300,000,000 |  |
Line of Credit Facility, Expiration Date | May 01, 2018 |  |
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] | Term Loan [Member] | 2014 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 250,000,000 |  |
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% |

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