| Schedule of Debt [Table Text Block] |
A summary of debt obligation activity for the three months ended March 31, 2015 is presented below: | | | | | | | | | | | | | | | | | | | | | | | | | | (in thousands) | | Revolving
Credit
Facilities | | Other Debt
Obligations | | Capital
Leases | | 1.5%
Convertible
Debentures
Due 2044 | | Term Loan A | | Total | Balance as of December 31, 2014 | | $ | 5,316 |
| | $ | 6,035 |
| | $ | 4,364 |
| | $ | 337,986 |
| | $ | 72,187 |
| | $ | 425,888 |
| Increases (decreases): | | | | | |
| | | | | | | Net borrowings (repayments) | | 252 |
| | (600 | ) | | 1,264 |
| | — |
| | (938 | ) | | (22 | ) | Accretion | | — |
| | — |
| | — |
| | 2,425 |
| | — |
| | 2,425 |
| Capital lease interest | | — |
| | — |
| | 86 |
| | — |
| | — |
| | 86 |
| Foreign currency exchange loss (gain) | | 48 |
| | (572 | ) | | (351 | ) | | — |
| | — |
| | (875 | ) | Balance as of March 31, 2015 | | 5,616 |
| | 4,863 |
| | 5,363 |
| | 340,411 |
| | 71,249 |
| | 427,502 |
| Less — current maturities | | — |
| | (4,828 | ) | | (2,186 | ) | | — |
| | (5,625 | ) | | (12,639 | ) | Long-term obligations as of March 31, 2015 | | $ | 5,616 |
| | $ | 35 |
| | $ | 3,177 |
| | $ | 340,411 |
| | $ | 65,624 |
| | $ | 414,863 |
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