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(Narratives)(Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance | $ 1,200 | $ 1,000 |
Accumulated net earning | $ 315,573 | $ 249,567 |
U.S. federal statutory tax rate | 35.00% | 35.00% | 35.00%
Gross deferred tax assets | $ 34,400 | $ 29,200 |
Gross deferred tax liabilities | 107,500 | $ 89,700 |
Internal Revenue Service (IRS) [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 0 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 0 |  |
Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 5,800 |  |
Accumulated net earning | 16,300 |  |
Minimum [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 800 |  |
Maximum [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 1,300 |  |

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