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Financial Commitments (Narrative) (Details) |  | 9 Months Ended
--- | --- | ---
Apr. 19, 2017 USD ($) | Sep. 30, 2017 USD ($) d / item $ / shares shares
Letters Of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 150,000,000 |
Maximum borrowing capacity |  | $ 150,000,000
Swingline Loans [Member] |  |
Debt Instrument [Line Items] |  |
Face amount |  | 10,000,000
Convertible Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount |  | $ 200,000,000
Interest rate |  | 2.875%
Maturity date |  | Jun. 15, 2021
Conversion price, shares | shares |  | 33.0579
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 |  | 10 days
Percentage of conversion price |  | 98.00%
Conversion price, principal amount |  | $ 1,000
Convertible Notes [Member] | Circumstance Two [Member] |  |
Debt Instrument [Line Items] |  |
Business day period within consecutive trading day period | d / item |  | 20
Consecutive trading day period |  | 30 days
Percentage of conversion price |  | 130.00%
Conversion stock price trigger | $ / shares |  | $ 39.32
Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | 250,000,000 |
2010 Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 300,000,000 |
Interest rate | 7.625% |
Maturity date | Nov. 01, 2018 |
2017 Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Effective interest rates |  | 7.13%
2017 Senior Notes [Member] | Private Placement [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%
2017 Senior Notes [Member] | Circumstance One [Member] | Private Placement [Member] |  |
Debt Instrument [Line Items] |  |
Redemption price |  | 100.00%
2017 Senior Notes [Member] | Circumstance Two [Member] | Private Placement [Member] |  |
Debt Instrument [Line Items] |  |
Percentage of notes that can be redeemed |  | 40.00%
Redemption price |  | 106.875%
2017 Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Applicable margin and letter of credit fees will be increased percentage per annum. |  | 2.00%
Weighted-average annual interest rate on borrowings |  | 3.86%
Maximum borrowing capacity |  | $ 350,000,000
Additional borrowing |  | 150,000,000
Available borrowing capacity |  | $ 197,000,000
Maturity date |  | Apr. 20, 2022
Fixed charge coverage ratio |  | 1.25
2017 Credit Facility [Member] | Minimum [Member[ |  |
Debt Instrument [Line Items] |  |
Consolidated leverage ratio |  | 3.25
2017 Credit Facility [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Consolidated leverage ratio |  | 4.00
2017 Credit Facility [Member] | LIBOR [Member] | Minimum [Member[ |  |
Debt Instrument [Line Items] |  |
Basis points added to reference rate (as a percent) |  | 1.50%
2017 Credit Facility [Member] | LIBOR [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Basis points added to reference rate (as a percent) |  | 3.00%
2017 Credit Facility [Member] | Base Rate [Member] | Circumstance Three [Member] |  |
Debt Instrument [Line Items] |  |
Basis points added to reference rate (as a percent) |  | 1.00%
2017 Credit Facility [Member] | Base Rate [Member] | Circumstance Four [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 0.00%
2017 Credit Facility [Member] | Base Rate [Member] | Minimum [Member[ |  |
Debt Instrument [Line Items] |  |
Basis points added to reference rate (as a percent) |  | 0.50%
2017 Credit Facility [Member] | Base Rate [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Basis points added to reference rate (as a percent) |  | 2.00%
2017 Credit Facility [Member] | Federal Funds Rate [Member] | Circumstance Two [Member] |  |
Debt Instrument [Line Items] |  |
Basis points added to reference rate (as a percent) |  | 0.50%
2014 Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Maturity date | May 01, 2018 |
Maximum borrowing capacity | $ 300,000,000 |
2014 Credit Facility [Member] | LIBOR [Member] | Minimum [Member[ | Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Basis points added to reference rate (as a percent) | 1.25% |
2014 Credit Facility [Member] | LIBOR [Member] | Maximum [Member] | Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Basis points added to reference rate (as a percent) | 3.00% |

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