| **Acquisitions (Summary Of Estimate Of Fair Value Of Identifiable Assets Acquired And Liabilities Assumed) (Details) - USD ($) $ in Thousands** | 3 Months Ended | 9 Months Ended |           |          |           |
|-------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|-----------|----------|-----------|
||
| **Business Acquisition [Line Items]**                                                                                                           |           |           |      |     |      |   |   |   |
| Payments to Acquire Businesses, Net of Cash Acquired                                                                                            |           |           |      | $ 20,245 | $ 182,500 |   |   |   |
| Wilmot [Member]                                                                                                                                 |           |           |      |     |      |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                           |           |           |      |     |      |   |   |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                           |           |           |      |     |      | $ 12,500 |   |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill                   |           |           |      |     |      | 400 |   |   |
| Goodwill, Acquired During Period                                                                                                                | $ 7,400        |           |      |     |      |   |   |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable                    |           |           |      |     |      | $ 300 |   |   |
| Business Combination, Consideration Transferred                                                                                                 | $ 20,200       |           |      |     |      |   |   |   |
| Perisher [Member]                                                                                                                               |           |           |      |     |      |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                           |           |           |      |     |      |   |   |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables                              |           |           |      |     |      |   | $ 1,494 |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                           |           |           |      |     |      |   | 126,287 |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill                   |           |           |      |     |      |   | 5,458 |   |
| Goodwill, Acquired During Period                                                                                                                |           | $ 31,657       |      |     |      |   |   |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets                                                   |           |           |      |     |      |   | 170,280 |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable                    |           |           |      |     |      |   | 11,394 |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue                    |           |           |      |     |      |   | 15,906 |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                                              |           |           |      |     |      |   | $ 45,729 |   |
| Business Combination, Consideration Transferred                                                                                                 |           | $ 124,551      |      |     |      |   |   |   |
| PCMR [Member]                                                                                                                                   |           |           |      |     |      |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                           |           |           |      |     |      |   |   |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables                              |           |           |      |     |      |   |   | $ 930 |
| Business Acquisition, Purchase Price Allocation, Current Assets, Other Current Assets                                                           |           |           |      |     |      |   |   | 3,075 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                           |           |           |      |     |      |   |   | 76,605 |
| Business Acquisition, Purchase Price Allocation, Deferred Taxes Asset (Liab), Net, Noncurrent                                                   |           |           |      |     |      |   |   | 7,428 |
| Business Acquisition, Purchase Price Allocation, Real estate held for sale and investment                                                       |           |           |      |     |      |   |   | 7,000 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill                   |           |           |      |     |      |   |   | 27,650 |
| Goodwill, Acquired During Period                                                                                                                |           |           | $ 92,516  |     |      |   |   |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets                                                   |           |           |      |     |      |   |   | 215,204 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable                    |           |           |      |     |      |   |   | 1,935 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue                    |           |           |      |     |      |   |   | 4,319 |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                                              |           |           |      |     |      |   |   | $ 6,254 |
| Business Combination, Consideration Transferred                                                                                                 |           |           | $ 208,950 |     |      |   |   |   |

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.
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Amount of assets acquired at the acquisition date.
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| - Definition
Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.
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Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.
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Amount of deferred revenue expected to be recognized as such within one year or the normal operating cycle, if longer, assumed at the acquisition date.
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Amount of deferred tax asset attributable to deductible temporary differences and carryforwards that are expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.
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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.
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Amount of liabilities assumed at the acquisition date.
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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.
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The amount of property, plant, and equipment recognized as of the acquisition date.
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.
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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.
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