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Supplemental Cash Flow Information (Summary Of Supplemental Cash Flow Information) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash Paid During The Period For    
Interest $ 14,739 $ 8,178
Income taxes, net of refunds 6,681 11,963
Noncash Investing and Financing Activities    
Increase (decrease) in accounts payable associated with acquisition of property and equipment 389 (225)
Capital lease obligations $ 32 $ 48