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Consolidating Financial Information (Condensed Consolidating Statements of Cash Flows) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash provided from (used in) operating activities $ 27,128 $ 63,090
Cash flows from investing activities:    
Capital expenditures (16,109) (7,432)
Deposits for interest rate swap (2,982) (5,079)
Return of deposits for interest rate swap 6,850 8,340
Payments on settlement of interest rate swap (2,617) (2,574)
Receipts from settlement of interest rate swap 82 100
Cash provided from (used in) investing activities (14,776) (6,645)
Cash flows from financing activities:    
Net borrowings (repayments) under revolving credit facility 1,000 (22,000)
Repayment of Foundry Park I mortgage loan 0 (715)
Net borrowings (repayments) under lines of credit 811 (223)
Dividends paid (11,998) (10,054)
Debt issuance costs (1,115) (2,351)
Repurchases of common stock (22,508) 0
Issuance of intercompany note payable, net 0  
Repayment of intercompany note payable, net 0  
Financing from affiliated companies 0 0
Cash provided from (used in) financing activities (33,810) (35,343)
Effect of foreign exchange on cash and cash equivalents (3,658) 1,274
(Decrease) increase in cash and cash equivalents (25,116) 22,376
Cash and cash equivalents at beginning of year 89,129 50,370
Cash and cash equivalents at end of period 64,013 72,746
Parent Company [Member]
    
Cash provided from (used in) operating activities 92,885 (19,495)
Cash flows from investing activities:    
Capital expenditures 0 0
Deposits for interest rate swap (2,982) (5,079)
Return of deposits for interest rate swap 6,850 8,340
Payments on settlement of interest rate swap (2,617) (2,574)
Receipts from settlement of interest rate swap 82 100
Cash provided from (used in) investing activities 1,333 787
Cash flows from financing activities:    
Net borrowings (repayments) under revolving credit facility 1,000 (22,000)
Repayment of Foundry Park I mortgage loan   0
Net borrowings (repayments) under lines of credit 0 0
Dividends paid (11,998) (10,054)
Debt issuance costs (1,115) (2,351)
Repurchases of common stock (22,508)  
Issuance of intercompany note payable, net 0  
Repayment of intercompany note payable, net 3,006  
Financing from affiliated companies (67,601) 53,113
Cash provided from (used in) financing activities (99,216) 18,708
Effect of foreign exchange on cash and cash equivalents 0 0
(Decrease) increase in cash and cash equivalents (4,998) 0
Cash and cash equivalents at beginning of year 5,001 17
Cash and cash equivalents at end of period 3 17
Non-Guarantor Subsidiaries [Member]
    
Cash provided from (used in) operating activities (174) 12,483
Cash flows from investing activities:    
Capital expenditures (7,726) (2,388)
Deposits for interest rate swap 0 0
Return of deposits for interest rate swap 0 0
Payments on settlement of interest rate swap 0 0
Receipts from settlement of interest rate swap 0 0
Cash provided from (used in) investing activities (7,726) (2,388)
Cash flows from financing activities:    
Net borrowings (repayments) under revolving credit facility 0 0
Repayment of Foundry Park I mortgage loan   0
Net borrowings (repayments) under lines of credit 811 (223)
Dividends paid (9,916) (5,857)
Debt issuance costs 0 0
Repurchases of common stock 0  
Issuance of intercompany note payable, net 3,135  
Repayment of intercompany note payable, net 0  
Financing from affiliated companies 0 0
Cash provided from (used in) financing activities (5,970) (6,080)
Effect of foreign exchange on cash and cash equivalents (3,187) 719
(Decrease) increase in cash and cash equivalents (17,057) 4,734
Cash and cash equivalents at beginning of year 76,926 40,700
Cash and cash equivalents at end of period 59,869 45,434
Guarantor Subsidiaries [Member]
    
Cash provided from (used in) operating activities 76,432 75,997
Cash flows from investing activities:    
Capital expenditures (8,383) (5,044)
Deposits for interest rate swap 0 0
Return of deposits for interest rate swap 0 0
Payments on settlement of interest rate swap 0 0
Receipts from settlement of interest rate swap 0 0
Cash provided from (used in) investing activities (8,383) (5,044)
Cash flows from financing activities:    
Net borrowings (repayments) under revolving credit facility 0 0
Repayment of Foundry Park I mortgage loan   (715)
Net borrowings (repayments) under lines of credit 0 0
Dividends paid (86,585) (38)
Debt issuance costs 0 0
Repurchases of common stock 0  
Issuance of intercompany note payable, net (3,135)  
Repayment of intercompany note payable, net (3,006)  
Financing from affiliated companies 22,087 (53,113)
Cash provided from (used in) financing activities (70,639) (53,866)
Effect of foreign exchange on cash and cash equivalents (471) 555
(Decrease) increase in cash and cash equivalents (3,061) 17,642
Cash and cash equivalents at beginning of year 7,202 9,653
Cash and cash equivalents at end of period 4,141 27,295
Total Consolidating Adjustments [Member]
    
Cash provided from (used in) operating activities (142,015) (5,895)
Cash flows from investing activities:    
Capital expenditures 0 0
Deposits for interest rate swap 0 0
Return of deposits for interest rate swap 0 0
Payments on settlement of interest rate swap 0 0
Receipts from settlement of interest rate swap 0 0
Cash provided from (used in) investing activities 0 0
Cash flows from financing activities:    
Net borrowings (repayments) under revolving credit facility 0 0
Repayment of Foundry Park I mortgage loan   0
Net borrowings (repayments) under lines of credit 0 0
Dividends paid 96,501 5,895
Debt issuance costs 0 0
Repurchases of common stock 0  
Issuance of intercompany note payable, net 0  
Repayment of intercompany note payable, net 0  
Financing from affiliated companies 45,514 0
Cash provided from (used in) financing activities 142,015 5,895
Effect of foreign exchange on cash and cash equivalents 0 0
(Decrease) increase in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of year 0 0
Cash and cash equivalents at end of period $ 0 $ 0