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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy    
Balance at beginning of period $ (3,910) $ 41,159
Total gains (losses) (realized or unrealized):    
Realized and unrealized gains (losses) included in earnings (33,804) 33,822
Included in other comprehensive income (21,068) 24,287
Settlements 74,271 (33,822)
Transfers in and/or out of level 3 0 0
Balance at end of period 15,489 65,446
Change in unrealized gains (losses) relating to assets and liabilities still held at the end of the period $ 40,467 $ 0