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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |
Schedule of contractual obligation, five years [Table Text Block] | The annual minimum payments for the next five years and total minimum payments thereafter are presented below:
Years Ending December 31, |  | Amount (in thousands)
2019 |  | $ | 132,502 |
2020 |  | 103,169 |
2021 |  | 88,785 |
2022 |  | 70,741 |
2023 |  | 37,334 |
Thereafter |  | 24,931 |
Total |  | $ | 457,462 |

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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