| **Schedule 1 - Condensed Parent Company Financial Statements (Narrative) (Details) - Parent Company [Member] - USD ($) $ in Thousands** | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Condensed Financial Statements, Captions [Line Items]**                                                                               |            |   |   |
| Dividends paid to parent by wholly-owned subsidiaries                                                                                   | $ 101,625       | $ 81,250 | $ 51,100 |
| Revolving credit agreement                                                                                                              | 550,000         |   |   |
| Accounts receivable - affiliates                                                                                                        | 134,779         | 104,494 |   |
| Notes Receivable, Related Parties                                                                                                       | $ 411,985       | $ 369,740 |   |

| X                                                                                                                                                                                                               |
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No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries.
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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
For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.
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| X                                                                                                                                            |
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