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Subsequent Event (Notes)
9 Months Ended
Sep. 30, 2018
Subsequent Event [Line Items]  
Subsequent Events [Text Block]
In October 2018, the Company terminated its existing cross-currency swap agreements, de-designating the swaps as net investment hedges and receiving approximately $1.1 million of cash. The Company also entered into new cross currency swap agreements to hedge its net investment in Euro-denominated assets against future volatility in the exchange rate between the U.S. dollar and the Euro. The new agreements have a five year tenor at notional amounts declining from $125.0 million to $75.0 million over the contract period. Under the terms of the swap agreements, the Company is to receive net interest payments at a fixed rate of approximately 2.9% of the notional amount.