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Derivatives - Schedule of gross and net amounts of derivative instruments that are subject to enforceable master netting arrangements or similar agreements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Assets Presented in the condensed consolidated balance sheet	$ 22,516	$ 39,045
Financial Instruments	8,560	7,917
Cash Collateral Received	6,168	12,094
Net Amount	7,788	19,034
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet	10,528	8,819
Financial Instruments	8,560	7,917
Cash Collateral Pledged	1,968	902
Net Amount	0	0
Counterparty 1
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Assets Presented in the condensed consolidated balance sheet	886	1,128
Financial Instruments	886	1,041
Cash Collateral Received	0	0
Net Amount	0	87
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet	1,440	1,041
Financial Instruments	886	1,041
Cash Collateral Pledged	554	0
Net Amount	0	0
Counterparty 2
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Assets Presented in the condensed consolidated balance sheet	1,648	4,998
Financial Instruments	528	400
Cash Collateral Received	0	1,629
Net Amount	1,120	2,969
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet	528	400
Financial Instruments	528	400
Cash Collateral Pledged	0	0
Net Amount	0	0
Counterparty 3
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Assets Presented in the condensed consolidated balance sheet	7,912	16,066
Financial Instruments	3,897	3,509
Cash Collateral Received	0	0
Net Amount	4,015	12,557
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet	3,897	3,509
Financial Instruments	3,897	3,509
Cash Collateral Pledged	0	0
Net Amount	0	0
Counterparty 4
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Assets Presented in the condensed consolidated balance sheet	1,054	1,351
Financial Instruments	1,054	1,351
Cash Collateral Received	0	0
Net Amount	0	0
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet	1,540	1,360
Financial Instruments	1,054	1,351
Cash Collateral Pledged	486	9
Net Amount	0	0
Counterparty 5
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Assets Presented in the condensed consolidated balance sheet	1,656	3,198
Financial Instruments	1,656	1,054
Cash Collateral Received	0	0
Net Amount	0	2,144
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet	1,804	1,054
Financial Instruments	1,656	1,054
Cash Collateral Pledged	148	0
Net Amount	0	0
Counterparty 6
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Assets Presented in the condensed consolidated balance sheet	8,674	12,234
Financial Instruments	458	492
Cash Collateral Received	5,608	10,465
Net Amount	2,608	1,277
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet	458	492
Financial Instruments	458	492
Cash Collateral Pledged	0	0
Net Amount	0	0
Counterparty 7
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Assets Presented in the condensed consolidated balance sheet	31	2
Financial Instruments	31	2
Cash Collateral Received	0	0
Net Amount	0	0
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet	480	59
Financial Instruments	31	2
Cash Collateral Pledged	449	57
Net Amount	0	0
Counterparty 8
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Assets Presented in the condensed consolidated balance sheet	50	0
Financial Instruments	50	0
Cash Collateral Received	0	0
Net Amount	0	0
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet	381	0
Financial Instruments	50	0
Cash Collateral Pledged	331	0
Net Amount	0	0
Counterparty 9
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Assets Presented in the condensed consolidated balance sheet	605	68
Financial Instruments	0	68
Cash Collateral Received	560	0
Net Amount	45	0
Gross Amounts not offset in the condensed consolidated balance sheet
Gross Amounts of Liabilities Presented in the condensed consolidated balance sheet		904
Financial Instruments		68
Cash Collateral Pledged		836
Net Amount		$ 0

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