Fair Value Measurements: Level 3 Roll Forward (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, at beginning of period	$ (25,274)	$ (13,185)	$ (29,316)	$ (10,945)
Total unrealized income (loss) included in earnings	2,437	(3,015)	6,479	(5,255)
Balance, at end of period	$ (22,837)	$ (16,200)	$ (22,837)	$ (16,200)