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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
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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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