| **Long Term Debt (Narratives) (Details)**                                                              | 12 Months Ended |               |
|--------------------------------------------------------------------------------------------------------|-----------------|---------------|
||
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Debt issuance costs                                                                                    | $ 5,451,000     | $ 13,979,000  | $ 84,000 |   |
| Loss on extinguishment of debt                                                                         | 640,000         | 27,700,000    | $ 0 |   |
| Long-term debt, gross                                                                                  | 1,373,783,000   | 1,372,113,000 |   |   |
| Letters of credit outstanding                                                                          | 21,000,000      |          |   |   |
| Unamortized discount                                                                                   | $ 21,878,000    | 24,007,000    |   |   |
| Accrued Interest to Stock Appreciation Right Conversion Rate                                           | 0.04            |          |   |   |
| Stock Appreciation Rights (SARs) | Class A Common Stock                                                |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Stock appreciation rights | shares                                                                     |            |          |   | 3,000,000 |
| Exercise price of rights | $ / shares                                                                  |            |          |   | $ 13.00 |
| Searchlight ALX, LP Promissory Note [Member] | Stock Appreciation Rights (SARs) | Class A Common Stock |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Stock appreciation rights | shares                                                                     |            |          |   | 3,000,000 |
| Exercise price of rights | $ / shares                                                                  |            |          |   | $ 13.00 |
| Medium-term Notes [Member] | Senior Credit Facility                                                    |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Loan fees and other expenses                                                                           | $ 200,000       |          |   |   |
| Debt issuance costs                                                                                    | 3,900,000       |          |   |   |
| Loss on extinguishment of debt                                                                         | 600,000         |          |   |   |
| Line of Credit [Member] | Senior Credit Facility | Revolving Credit Facility                           |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Long-term debt, gross                                                                                  | 55,000,000      | 0             |   |   |
| Maximum borrowing capacity                                                                             | 200,000,000     |          |   |   |
| Remaining borrowing capacity                                                                           | 124,000,000     |          |   |   |
| Senior Notes [Member] | 2025 Notes                                                                     |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Long-term debt, gross                                                                                  | $ 450,000,000   | 450,000,000   |   |   |
| Frequency of periodic payment                                                                          | semi-annually   |          |   |   |
| Senior Notes [Member] | 2025 Notes | Minimum                                                           |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Percentage of principal                                                                                | 100.00%         |          |   |   |
| Senior Notes [Member] | 2025 Notes | Maximum                                                           |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Percentage of principal                                                                                | 101.00%         |          |   |   |
| Senior Notes [Member] | 2019 Notes                                                                     |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Loss on extinguishment of debt                                                                         |            | 27,700,000    |   |   |
| Senior Notes [Member] | 2021 Notes                                                                     |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Long-term debt, gross                                                                                  | $ 325,000,000   | 325,000,000   |   |   |
| Frequency of periodic payment                                                                          | Semi-annually   |          |   |   |
| Senior Notes [Member] | 2021 Notes | Minimum                                                           |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Percentage of principal                                                                                | 100.00%         |          |   |   |
| Senior Notes [Member] | 2021 Notes | Maximum                                                           |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Percentage of principal                                                                                | 101.00%         |          |   |   |
| Unsecured Debt [Member] | Searchlight ALX, LP Promissory Note [Member]                                 |            |          |   |   |
| **Debt Instrument [Line Items]**                                                                       |            |          |   |   |
| Long-term debt, gross                                                                                  | $ 75,000,000    | $ 75,000,000  |   |   |
| Face amount of debt                                                                                    |            |          |   | $ 75,000,000.0 |
| Unamortized discount                                                                                   |            |          |   | $ 21,700,000 |

| X                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Rate of stock appreciation rights issued per unit of Interest accrued
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| X                                                                                                                                                                                                                                                                          |
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| - Definition
Debt Instrument, Percentage of Principal Amount
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Exercise price per share or per unit of warrants or rights outstanding.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of warrants or rights outstanding.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Face (par) amount of debt instrument at time of issuance.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of the frequency of periodic payments (monthly, quarterly, annual).
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after accumulated amortization, of debt discount.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the charge against earnings during the period for commitment fees and debt issuance expenses.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.
+ References
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| - Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).
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| - Definition
The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.
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