Medium Large Transport; Low Wing; 2 Turbojet Eng
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 20
Distraction; Communication Breakdown; Confusion; Situational Awareness
ATC Issue All Types; Deviation - Altitude Undershoot; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented
Airspace Structure; Human Factors; Procedure
Aircraft released via Redmond SID and heading 170. Pilot checked on after departure correctly and I issued 'radar contact; leaving 7;000 [direct] SUNBE (couple hundred miles south) and restated climb to 140;00.' Read back was marginal with '[direct] SUNBE; maintain 14;000'. No alt to make turn so my assumption is he's going direct now. I restated 'SUNBE at 7;000 please' and he said to effect 'garbled... sorry SUNBE cross 7;000 and then 14;000 after that.' Typically; the aircraft is not even close to our Minimum Vectoring Altitude to go on course if Tower ships them in a timely manner at that point. Typically the jet will be on course in around 12 to 15 miles from departure. While this was going on I had several VFR practice approaches and VFR aircraft so my attention was drawn to potential conflict. I called in the blind for VFR aircraft as well as Tower. Somehow I missed that this jet actually read back fix 'cross' at 7;000 which would never in my years have made sense. I'm surprised that the pilot did not query me. 7;000 feet for 200+ miles or something like that then climb? Despite being distracted with the conflict potential and the fact that I heard fix; alt and top alt I trusted what I heard was issued. After the pilot asked when I came back online from the Tower I realized what may have happened and at that point reissued top altitude and for him to continue climb to my next higher terrain. On my part; hearing the crossing word had implications for sure. On the pilot side; the responsibility of accepting a clearance should have some weight.
Center Controller reported an aircraft flew below the Minimum Vectoring Altitude due to an incorrect readback of the controller's clearance.