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Notes Payable (Details) (USD $) | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 2023 Notes | Apr. 30, 2013 2023 Notes | Jun. 30, 2014 2024 Notes | May 31, 2014 2024 Notes instrument | May 31, 2014 Forward Contracts instrument | Dec. 31, 2013 Forward Contracts instrument | Apr. 30, 2013 Forward Contracts instrument | Apr. 30, 2013 Forward Contracts 2023 Notes | May 31, 2014 Forward Contracts 2024 Notes
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Original Principal |  |  |  |  | $ 350,000,000 |  | $ 350,000,000 |  |  |  |  |
Stated interest rate |  |  |  |  | 3.30% |  | 3.90% |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  | 347,406,000 |  | 349,293,000 |  |  |  |  |  |
Notes payable, unamortized discount | 10,909,000 |  | 10,816,000 |  | 2,594,000 |  | 707,000 |  |  |  |  |
Effective Interest Rate |  |  |  |  | 3.388% |  | 3.924% |  |  |  |  |
Number of interest rate derivatives held |  |  |  |  |  |  | 3 | 3 | 4 | 4 |  |
Derivative, Notional Amount |  |  |  |  |  |  | 225,000,000 | 225,000,000 | 240,000,000 | 240,000,000 |  |
Interest rate cash flow hedge liability, fair value |  |  |  |  |  |  |  |  |  | 3,156,000 | 3,156,000 |
Amount of cash flow hedge reported in AOCI |  |  |  |  |  |  |  | 6,312,000 |  | 3,141,000 | 3,141,000 | 6,312,000
Proceeds from notes payable | 349,293,000 | 347,406,000 |  | 344,266,000 |  | 346,068,000 |  |  |  |  |  |
Debt Issuance Cost |  |  |  | $ 3,140,000 |  | $ 3,225,000 |  |  |  |  |  |

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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