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Acquisitions: Acquisition - Pro Forma Results (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Business Combinations [Abstract]        
Total revenues $ 255,987 [1] $ 254,720 [1] $ 522,110 [1] $ 508,655 [1]
Income (loss) from continuing operations $ 18,199 [1] $ 92,610 [1] $ 37,917 [1] $ 113,785 [1]
[1] This unaudited pro forma supplemental information does not purport to be indicative of what the Company's operating results would have been had these transactions occurred on January 1, 2013, and may not be indicative of future operating results. The Company has excluded remeasurement gains and acquisition costs from these pro forma results as they are considered significant non-recurring adjustments directly attributable to these transactions.