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Financial Commitments (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Apr. 20, 2017 | Apr. 20, 2017 | Mar. 31, 2017
Letters Of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount |  |  | $ 150,000,000
Letters of credit outstanding |  |  | 200,000
Letters Of Credit [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 150,000,000 | $ 150,000,000 |
Applicable margin and letter of credit fees will be increased percentage per annum. | 2.00% |  |
Swingline Loans [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 10,000,000 | 10,000,000 |
Convertible Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount |  |  | $ 200,000,000
Interest rate |  |  | 2.875%
Maturity date |  |  | Jun. 15, 2021
Percentage of conversion price |  |  | 130.00%
Conversion price, shares |  |  | 33.0579
Conversion price |  |  | $ 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 after consecutive trading day period |  |  | 20 days
Percentage of conversion price |  |  | 130.00%
Conversion price |  |  | $ 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
Effective interest rates |  |  | 7.99%
2017 Senior Notes [Member] | Private Placement [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 500,000,000 | $ 500,000,000 |
Interest rate | 6.875% | 6.875% |
Redemption price, change of control triggering event (as a percent) |  | 101.00% |
2017 Senior Notes [Member] | Circumstance One [Member] | Private Placement [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price |  | 100.00% |
2017 Senior Notes [Member] | Circumstance Two [Member] | Private Placement [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price |  | 106.875% |
Minimum [Member[ | Convertible Notes [Member] | Circumstance Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Consecutive trading day period |  |  | 30 days
Maximum [Member] | 2017 Senior Notes [Member] | Circumstance Two [Member] | Private Placement [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of notes that can be redeemed |  | 40.00% |
2014 Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date |  |  | May 01, 2018
Effective interest rates |  |  | 9.86%
2017 Credit Facility [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | Apr. 20, 2022 |  |
Additional borrowing | $ 150,000,000 | $ 150,000,000 |
Fixed charge coverage ratio | 1.25 |  |
2017 Credit Facility [Member] | Minimum [Member[ | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Consolidated leverage ratio | 3.25 | 3.25 |
2017 Credit Facility [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Consolidated leverage ratio | 4.00 | 4.00 |
2014 Revolver [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  |  | $ 300,000,000
Available borrowing capacity |  |  | $ 114,800,000
2014 Revolver [Member] | LIBOR | Minimum [Member[ | Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis points added to reference rate (as a percent) |  |  | 1.25%
2014 Revolver [Member] | LIBOR | Maximum [Member] | Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis points added to reference rate (as a percent) |  |  | 3.00%
2017 Revolver [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 350,000,000 | $ 350,000,000 |
2017 Revolver [Member] | LIBOR | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis points added to reference rate (as a percent) | 2.50% |  |
2017 Revolver [Member] | LIBOR | Circumstance Three [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis points added to reference rate (as a percent) | 1.00% |  |
2017 Revolver [Member] | LIBOR | Minimum [Member[ | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis points added to reference rate (as a percent) | 1.50% |  |
2017 Revolver [Member] | LIBOR | Maximum [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis points added to reference rate (as a percent) | 3.00% |  |
2017 Revolver [Member] | Base Rate [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 0.00% | 0.00% |
Basis points added to reference rate (as a percent) | 1.50% |  |
2017 Revolver [Member] | Base Rate [Member] | Minimum [Member[ | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis points added to reference rate (as a percent) | 0.50% |  |
2017 Revolver [Member] | Base Rate [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis points added to reference rate (as a percent) | 2.00% |  |
2017 Revolver [Member] | Federal Funds Rate [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis points added to reference rate (as a percent) | 0.50% |  |

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