Interest Rate Swap Agreements (Effect of Interest Rate Swap Agreements) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent \| Reclassification out of Accumulated Other Comprehensive Income
Derivative [Line Items]
Amount Recognized in Interest Expense (Pre-Tax)	$ 601	$ 609
Amount of Loss/(Gain) Recognized in Other Comprehensive Income/(Loss) on Derivative (Effective Portion) (Pre-Tax)	(604)	$ (208)
Interest Rate Swap \| Fair Value, Measurements, Recurring \| Level 2 \| Other Accrued Liabilities
Derivative [Line Items]
Interest rate swaps, Current	$ 1,158		$ 1,762

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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