Income Taxes (Net Current and Non-current Deferred Tax Assets and Liabilites By Segment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Current deferred tax asset	$ 21,399	$ 13,341
Valuation allowance	(158)	(86)
Current deferred tax liability	(1,190)	(1,348)
Non-current deferred tax asset	59,846	72,933
Valuation allowance	(11,908)	(10,477)
Non-current deferred tax liability	(43,928)	(36,170)
Net deferred tax asset	24,061	38,193
U.S. [Member]
Income Taxes [Line Items]
Current deferred tax asset	17,652	12,839
Current deferred tax liability	(2)	(62)
Net current deferred tax asset (liability)	17,650	12,777
Non-current deferred tax asset	31,414	55,704
Non-current deferred tax liability	(36,264)	(30,348)
Net non-current deferred tax asset (liability)	(4,850)	25,356
Net deferred tax asset	12,800	38,133
Europe [Member]
Income Taxes [Line Items]
Current deferred tax asset	3,576	107
Valuation allowance	(70)	(75)
Current deferred tax liability	(1,188)	(1,286)
Net current deferred tax asset (liability)	2,318	(1,254)
Non-current deferred tax asset	24,487	14,888
Valuation allowance	(9,900)	(10,233)
Non-current deferred tax liability	(5,909)	(3,401)
Net non-current deferred tax asset (liability)	8,678	1,254
Net deferred tax asset	10,996
Other International [Member]
Income Taxes [Line Items]
Current deferred tax asset	171	395
Valuation allowance	(88)	(11)
Net current deferred tax asset (liability)	83	384
Non-current deferred tax asset	3,945	2,341
Valuation allowance	(2,008)	(244)
Non-current deferred tax liability	(1,755)	(2,421)
Net non-current deferred tax asset (liability)	182	(324)
Net deferred tax asset	$ 265	$ 60