Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statement of Cash Flows Supplemental Disclosures (Net cash paid or received) (Details)

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Consolidated Statement of Cash Flows Supplemental Disclosures (Net cash paid or received) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Consolidated Statements of Cash Flows Supplemental Disclosures [Abstract]    
Interest Paid, Net of Amounts Capitalized $ 35,139 $ 34,671