XML 62 R68.htm IDEA: XBRL DOCUMENT

Fair Value Measurements (Narrative) (Details) (USD $)	6 Months Ended
Fair Value Measurements (Narrative) (Details) (USD $)	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Interest Rate Swap Contracts [Member]	Dec. 31, 2013 Interest Rate Swap Contracts [Member]	Jun. 30, 2014 Interest Rate Swap Contracts [Member] Level 2 [Member]	Dec. 31, 2013 Interest Rate Swap Contracts [Member] Level 2 [Member]	Jun. 30, 2014 Senior subordinated notes due September 2018 [Member]	Jun. 30, 2014 Convertible senior notes due December 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total additional asset retirement obligations incurred for the period	$ 3,100,000	$ 1,700,000
Derivative Liabilities, Total			65,816,000	65,578,000	65,816,000	65,578,000
Fair value of long term notes							$ 188,800,000	$ 263,800,000

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details