|
Financial Instruments (Details) (USD $)
|
12 Months Ended |
|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
| Derivative [Line Items] |
|
|
| Interest rate |
0.519% |
|
| Debt instrument interest, effective percentage rate |
2.14% |
|
| Interest rate margin for default |
1.63% |
|
| Deferred expenses related to derivative instruments accumulated in other comprehensive income expected to reclassified in the next twelve months |
$ 1,100,000 |
|
| Recurring Basis |
|
|
| Derivative [Line Items] |
|
|
| Interest rate swap liability |
1,096,000 |
1,719,000 |
| Interest Rate Swap |
|
|
| Derivative [Line Items] |
|
|
| Derivative, Term |
3 years |
|
| Notional amount of interest rate derivatives |
500,000,000 |
|
| Interest Rate Swap | Recurring Basis |
|
|
| Derivative [Line Items] |
|
|
| Interest expense reclassified from other comprehensive income into earnings |
1,700,000 |
|
| Interest Rate Swap | Significant Observable Inputs (Level 2) | Recurring Basis |
|
|
| Derivative [Line Items] |
|
|
| Interest rate swap liability |
$ 1,096,000 |
$ 1,719,000 |