Derivative Instruments and Hedging Activities (Offsetting Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ (1,189)
Gross Amounts Offset in the Statement of Financial Position	(2,813)
Net Amounts of Liabilities Presented in the Statement of Financial Position	(4,002)
Financial Instruments	2,813
Cash Collateral Pledged	0
Net Amount	(1,189)
Counterparty 1 [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	(1,189)
Gross Amounts Offset in the Statement of Financial Position	(2,813)
Net Amounts of Liabilities Presented in the Statement of Financial Position	(4,002)
Financial Instruments	2,813
Cash Collateral Pledged	0
Net Amount	$ (1,189)