The included fee-rate in your transaction is "Fee per byte 166.203 sat/B".
The recommended fee-rate right now (underestimation IMO) by tradeblock is: ~100 sat/B -
https://tradeblock.com/bitcoin.
The recommended fee-rate right now (somewhat overestimation) by 21.co is: ~300 sat/B -
https://bitcoinfees.21.co/
I think that your transaction may take a while to process because:
1) Blocks have started taking more than 10 minutes on average (variance + possible loss of hashrate) which is temporary.
2) Another mini spam attack may be present.
