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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accumulated depreciation	$ 205,561	$ 174,796
Accumulated amortization	$ 29,397	$ 25,096
Voting units
Members' / stockholders' equity units issued (in units)	100	100
Members' / stockholders' equity units outstanding (in units)	100	100
Non-voting units
Members' / stockholders' equity units issued (in units)	100	100
Members' / stockholders' equity units outstanding (in units)	100	100

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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