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Commitments and Contingencies Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract] |
Long-term Purchase Commitment [Table Text Block] | The annual minimum payments for the next five years and total minimum payments thereafter are presented below:
Years Ending December 31, |  | (in thousands)
2015 |  | $ | 224,897 |
2016 |  | 147,896 |
2017 |  | 118,320 |
2018 |  | 128,866 |
2019 |  | 132,920 |
Thereafter |  | 383,619 |
Total |  | $ | 1,136,518 |

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- Definition Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount. + References No definition available. + Details
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