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Revenue Sources and Concentration of Sales (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues | $ 79,241 | $ 72,025 | $ 118,672 | $ 139,536 | $ 135,523 | $ 113,461 | $ 126,157 | $ 148,590 | $ 409,474 | $ 523,731 | $ 772,854
Sales Revenue, Net [Member] | Customers Outside of US [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 23,212 | $ 34,039 | $ 62,589
Sales Revenue, Net [Member] | Largest Customer [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 21.00% | 23.00% | 22.00%
Sales Revenue, Net [Member] | Second Largest Customer [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 15.00% | 17.00% | 19.00%
Sales Revenue, Net [Member] | Third Largest Customer [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 12.00% | 15.00% | 10.00%

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