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Debt (Schedule of Interest Rate Swaps and Details) (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jul. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2017 | Apr. 01, 2016
Derivative [Line Items] |  |  |  |
Interest Expense |  |  | $ 28,893,000 | $ 27,617,000
Interest Rate Swap 4 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Term of Contract | 1 year |  |  |
Derivative Asset, Notional Amount | $ 250,000,000 |  |  |
Notional Amount |  |  | $ 250,000,000 |
Pay Fixed Rate |  |  | 0.615% |
Receive Current Floating Rate |  |  | 0.98% |
Fair Value, Asset |  |  | $ 244,000 |
Interest Rate Swap 3 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Term of Contract |  | 3 years |  |
Derivative Liability, Notional Amount |  | $ 200,000,000 |  |
Notional Amount |  |  | $ 200,000,000 |
Pay Fixed Rate |  |  | 1.1325% |
Fair Value, Asset |  |  | $ 3,536,000 |
Interest Rate Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized In Income Ineffective Portion |  |  | 0 | $ 0
Interest Expense |  |  | $ 100,000 |

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